The plume of air bubble curtains in still water is the most basic and pure dynamic process. To grasp its dynamic characteristics provides basis and reference for more complex plume movement in dredging engineering. Taking the formation process of a bubble plume in a flume as the research object, the characteristics of bubble formation …A feeling like an air bubble is in your chest can be a symptom of several conditions, ranging in seriousness. Some of these conditions are a cause of concern, while others may resolve on their own. Air Bubble. This spell creates a small pocket of breathable air that surrounds the touched creature’s head or the touched object. The air bubble allows the creature touched to breathe underwater or in similar airless environments. An item is surrounded by the bubble and is protected from water damage. A firearm within an air bubble van be ... Grab a plunger and set the bulb inside of the hole in your toilet. Repeatedly push down to force air into the drain pipe. This should clear any minor blockages that are causing your issues. You won’t see the air bubbles when flushing the toilet anymore. FYI, toilet plungers have a flange on the bottom of the bowl.Jun 21, 2020 · What is referred here as an air bubble, is actually a membrane of liquid form enclosing a volume of gas, and floating inside another volume of gas (usually air). And what people refer to as air bubbles, is this membrane, which like any other membrane has two surfaces, while a pure air bubble inside any liquid has only one surface. The bubble barrier system in the experiments consists of three main components: gas supply device including air compressors, pipes etc., a bubble curtain, and a plastic catchment device. For the gas supply system, a strip-shaped bubble generator pumping compressed air to the water tank was designed, to form a uniform and stable …Learn what air bubble flights are and how they work between India and other countries during the pandemic. Find out the eligibility, conditions, guidelines and number of flights …Hopscotch is the perfect activity for kids. It keeps them fairly contained and safe while letting them work off some steam. Plus, it’s fun. But what do you do when it’s cold or rai...The air causes bubbles in the coolant reservoir. How? Many vehicle cooling systems are pressurized and use a sealed hose system that allows coolant flow around the engine. When air finds its way into this closed system, it forms air pockets. The air pocket blocks the flow of liquid, which leads to a rise in temperature, causing coolant to boil ...Our collection of Sealed Air bubble rolls and wrap feature different dispense methods as well as material options, so you'll be able to find a selection that works for your packing, shipping or storing needs. If you're shipping large items, consider bubble rolls and wrap in 72"W x 1250'L or 48"W x 250'L sizes to accommodate your packing needs.Bubble size (mm). Air bubble 2 Layer, 1,300 – 1,500, 50 – 100, 10 – 25. Air bubble 3 Layer, 1,300 ...Air Bubble air-purifying eco-machine is also ecoLogicStudio’s first pneumatic bioreactor. It contains 6.000 liters of water supporting 200 liters of living Chlorella cultures filtering 100 liters of polluted urban air every minute. The air and water pressures are contained by a TPU membrane that is only 0.5mm thick and that only takes up 5% ...Air bubbles in particular are the enemy of practical HPLC and ion chromatography. They can cause shifting retention times, pulsating baselines, unexpected changes in peak areas, irregular peak shapes, pump outages and excessively high back pressures. This means that analytical scientists may be unable to distinguish between trace …In the fast-paced world of e-commerce, customer satisfaction is paramount. When customers receive their packages in perfect condition and with a delightful unboxing experience, the...Learn about the properties, applications, and effects of air bubbles in various fields of science and engineering. Find chapters from books and articles on topics such as …For small bubbles an inch or less wide, pierce the bubble with a large sewing needle. This releases the trapped air. Next, use a hot iron and towel to gently warm and flatten the area. This melts the adhesive, re-bonding the flooring. Place heavy books or objects on top until the vinyl cools and sets.Mar 8, 2024 · Let’s have a recap: Bubbles in tires are those zit-like air bubbles you’ll typically find on the side of your tires (eww!). They’re usually caused by some form of impact damage (collisions, driving too quickly over speed bumps, curbs, etc.) or manufacturing defect. 1- Make a Cut and Repair the Tape. The most common and effective method is to cut out the bubbled section of the tape with a utility knife and remove the tape to check the bubbles. If there are bubbles throughout, remove the entire tape. Then apply a new layer of joint compound (mixed with water to a creamy consistency) using a 6-inch knife and ... 15 Apr 2015 ... In still water, these bubbles would generate a circulation that looks like a squashed circle that points away from the tube on either side, ...The game times for the Sweet 16 round of the 2024 NCAA men's basketball tournament have been set. The third round begins Thursday with a matchup between No. …The bubble barrier system in the experiments consists of three main components: gas supply device including air compressors, pipes etc., a bubble curtain, and a plastic catchment device. For the gas supply system, a strip-shaped bubble generator pumping compressed air to the water tank was designed, to form a uniform and stable … The pressure difference between the inside and outside of a bubble depends upon the surface tension and the radius of the bubble. The relationship can be obtained by visualizing the bubble as two hemispheres and noting that the internal pressure which tends to push the hemispheres apart is counteracted by the surface tension acting around the cirumference of the circle. Air-bubble curtain is an amount of air injected vertically into a water body. The generation of such a flow and the lack of a continuous interface cannot be described by a smooth mathematical function. Therefore, a two-phase flow model is introduced. A numerical model for the concurrent flow of buoyant bubbles continuously flowing into a 2D water …Another bubble has emerged, courtesy of the bank-sector crisis which has already felled three U.S. regional banks.Read more on 'MarketWatch' Indices Commodities Currencies StocksReproduced from Figure 5.16 of ref. 3. Open in viewer. That the bubble wake is still stable at the onset of path instability is typical of liquids characterized by a low value of the Morton number Mo ≡ Bo3 / Ga4 = …Air Bubble could be used in an emergency to allow for underwater breathing in addition to using it in space. However, it is inferior to Water Breathing for these purposes in most ways. Water breathing …Oct 19, 2023 · An air bubble in a blood vessel causes an embolism. An embolism is an obstruction to the blood flow. It can range from asymptomatic to fatal consequences. A popular notion in movies and books is that stabbing a bad guy with an air-filled syringe results in an almost instantaneous – yet painful – death. It is at least painful enough to ... 21 Jun 2023 ... Does Resiner Bubble Remover ACTUALLY work? Today we're trying Resiner's bubble remover and seeing if it actually removes air bubbles from ...28 Jun 2014 ... The bubble is just from heat, which means that your iPhone basically melted underneath the top glass layer. This happens to many iPhones, and ...Injection molding air bubbles are a common issue that can occur during the manufacturing process, posing significant challenges to product quality. These tiny air pockets, if left unchecked, can lead to various defects and imperfections, compromising the integrity and functionality of injection-molded parts. To ensure high-quality, defect-free products, it is …The uncovered drywall seam will shrink, warp, crack, and provide a bad finish to your wall or ceiling. Instead of sanding drywall bubbles, follow our steps for a perfect fix. 7 Steps for Fixing Bubbles in Drywall Tape. Repairing an air …Pp Boxes & Crates, Air Bubble Roll & Stretch Film Manufacturer offered by Pioneer Enterprises (I) Private Limited from Pune, Maharashtra, India.Antarctic ice core records presently reach an age of 800 000 years BP (before present, where present is normally defined as 1950) (Jouzel et al., 2007).Air gets enclosed in bubbles at the firn–ice transition at 70–120 m depth below the surface, depending on temperature and accumulation rates.This means that air in the bubbles is younger than the surrounding ice by …Air Bubble Packaging Material. Paper Bubble Wrap Honeycomb Kraft Paper Rolls. Colored Air Bubble Bags. Air Bubble Pouches. + View all. Get Quote. Zipper Stand UP Pouches …Step 4: Reapply the Tempered Glass Screen Protector. Align the edges of the tempered glass screen protector with the device screen, ensuring that the camera and home button (if applicable) are properly positioned. Slowly lower the protector onto the screen, allowing it to naturally adhere while minimizing the introduction of air bubbles. Specifications. Electrical Input: 110V to 240V VAC, 50/60 Hz - Consumption: 1800 Watts (VA) max. Please contact Pro Pac or call 888-318-0083 for your protective packaging equipment. Sealed Air Bubble Wrap Universal Inflation System runs over 80 types of Bubble Wrap brand materials on demand. Pro Pac offers air pillow and bubble protective ... Apr 13, 2021 · Here, I talk about the eight most common causes of gas entrapment and the steps you can take to avoid it or make sure it's managed out of your production process. 1. Reducing excess fluid. Fluids ... PP Foam Sheet. Transparent Air Bubble Bag. Transparent Pp Stretch Film Roll. 30 GSM Air Bubble Roll. Xlpe Foam Sheet. EPE Foam Tube. Air Bubble Pouch. Call +91 …The game times for the Sweet 16 round of the 2024 NCAA men's basketball tournament have been set. The third round begins Thursday with a matchup between No. …21 Aug 2021 ... Uniknya air bubbles O2 ini ialah ia mengandungi oksigen semulajadi terlarutnya yang sangat tinggi dalam air dan satu satunya air mineral ...The signature Royal Blue branding pops against the classic backdrop for a clean callback to ‘86. This “Big Bubble” edition honors the origins of visible Nike Air, all while keeping it …Concrete casting molds are essential tools for creating various concrete products, from decorative accents to functional pieces. However, achieving smooth and air bubble-free surfa...The air bubble bags for packing is designed to anti prompt critical shock during the transportation, absorb the shock energy by expanding the film, but not break up. The LDPE based packing air bubbles are crystal clear, and with the customized logo print, that will- increase opening impression a lot. While the HDPE based film could be very thin ... Microbubble. Microbubbles are bubbles smaller than one hundredth of a millimetre in diameter, but larger than one micrometre. They have widespread application in industry, medicine, [1] life science, [2] and food technology. [3] The composition of the bubble shell and filling material determine important design features such as buoyancy, crush ... Bubble Pressure . The net upward force on the top hemisphere of the bubble is just the pressure difference times the area of the equatorial circle:. The force of the surface tension downward on the entire circumference of the circle is twice the surface tension times the circumference, since two surfaces contribute to the force: . This gives. This latter case also applies to the case of a ...Jan 10, 2022 · An air embolism is a bubble of air that enters your arteries or veins, most often as a complication from a medical procedure. When these bubbles travel, they can block blood supply in different parts of the body, like the heart, lungs, or brain. This can lead to serious problems, such as a stroke. The bubbles will sink rapidly to the bench top or the ground – a plastic tray on the floor will reduce the mess (and possible slipping hazard) and should allow some bubbles to settle without bursting. These bubbles will shrink on standing as carbon dioxide diffuses out of the bubble faster than the less soluble air diffuses in. AirBubble creates a purified microclimate for children to play in, a true bubble of clean air in the centre of Warsaw (Poland). The project is located within the public green space outside of the Copernicus Science Centre (Centrum Nauki Kopernik), a site which will also host a dedicated exhibition illustrating the design innovation behind the ... Sep 9, 2021 · The air bubble detachment is important, since this process involves the creation of surfaces (energy) and can therefore influence, the dynamics of the bubble as well as the surrounding flow field. 28 Jun 2014 ... The bubble is just from heat, which means that your iPhone basically melted underneath the top glass layer. This happens to many iPhones, and ...Air Bubble. Our product range includes a wide range of air bubble bags and air bubble rolls sheets. Request CallBack. Get Best Quote. Air Bubble Bags. Approx. Price: Rs 5 / Piece Get Latest Price. Product Details: We …LDS Industry LDS Air Cushion Wrap Roll Quilt Bubble Air Pillow Sheet Film Air Cushion Wrap - Length 984ft (Air Bubble Film - Inflatable Bubbles - 14.6"x9.8") dummy SOLTECH Inflatable Air Bubble Film Cushioning Wrap Rolls,Perforated, Easy to Tear,Large Air Bubble, 15.7 Inchx984 Feet Total,Packing, Industrial, Business Bubble Supply (Perforated ...Feb 26, 2023 · air bubble翻译：气泡。了解更多。 示例中的观点不代表剑桥词典编辑、剑桥大学出版社和其许可证颁发者的观点。 1- Make a Cut and Repair the Tape. The most common and effective method is to cut out the bubbled section of the tape with a utility knife and remove the tape to check the bubbles. If there are bubbles throughout, remove the entire tape. Then apply a new layer of joint compound (mixed with water to a creamy consistency) using a 6-inch knife and ... A summary of experimental results is presented here. Small air bubbles (i.e. ab < 1 mm) act as rigid spheres, surface tension imposing their shape. For very small bubbles (i.e. dab < 0.1 mm), the bubble rise velocity u is given by Stokes' law: (3A.4a) u r = g ( ρ w ρ) μ <. is the dynamic viscosity of water. The gastric bubble is a radiolucent rounded area generally nestled under the left hemidiaphragm representing gas in the fundus of the stomach. On a lateral radiograph, the gastric bubble is usually located between the abdominal wall and spine. It can be seen on chest or abdominal plain films. It is seen on approximately 70% of normal chest ...The game times for the Sweet 16 round of the 2024 NCAA men's basketball tournament have been set. The third round begins Thursday with a matchup between No. …Bubbles O2 Air Mineral Semula Jadi (800ml). RM4.00. 1 in stock. Add to cart. SKU: 100033511 Category: Minuman. Description; Additional information; Reviews (0). An air embolism, also known as a gas embolism, is a blood vessel blockage caused by one or more bubbles of air or other gas in the circulatory system. [1] Air can be introduced into the circulation during surgical procedures, lung over-expansion injury, decompression, and a few other causes. In flora, air embolisms may also occur in the xylem ... The air movement should cause the bubble to pop, just keep in mind these needs to be done before the curing process begins. Using a Vacuum Chamber This is the final method for bursting bubbles on a smaller project or mold.After you have fixed the air bubbles, allow the candle to cool and settle for at least 24 hours. This will ensure that the wax solidifies properly and retains its new, bubble-free appearance. Step 6: Finishing Touches. Once the candle has fully cooled and set, check for any remaining imperfections. Magic Items. This translucent, bubble-like sphere has a slightly tacky outer surface, and you gain the item’s benefits only while wearing it over your head like a helmet. The bubble contains 1 hour of breathable air. The bubble regains all its expended air daily at dawn. Jun 20, 2020 · In the normal atmosphere, the bubbles mostly consist of nitrogen, oxygen, and carbon dioxide (air). As heating continues, water vapor bubbles form around the air bubbles and tiny imperfections on the side and bottom of the container. This happens when water molecules gain enough energy to make the transition from the liquid phase to the gas phase. 10 Feb 2014 ... Top Anecdotal Signs of a Market Bubble · Covenant creep – Here the terms for new financial securities are especially bad for buyers. · New issue ...A feeling like an air bubble is in your chest can be a symptom of several conditions, ranging in seriousness. Some of these conditions are a cause of concern, while others may resolve on their own.In summary, visible air bubbles on your laminate are caused by high humidity and moisture content level content. Bubbling is fixed through creating expansion joints, the use of spacers and dehumidifiers, or even replacing the laminate board. Peaking is better fixed after identifying the cause. Minor bubbling can be fixed by busting and gluing ...Bubbles O2 Air Mineral Semula Jadi (800ml). RM4.00. 1 in stock. Add to cart. SKU: 100033511 Category: Minuman. Description; Additional information; Reviews (0).Here, I talk about the eight most common causes of gas entrapment and the steps you can take to avoid it or make sure it's managed out of your production process. 1. Reducing excess fluid. Fluids ...Speaking about the new modus operandi, Hardeep Puri said on Thursday, “Until international civil aviation can reclaim its pre-COVID numbers, the answer will lie in …The bubble rises to the surface because it weighs less than water. If there's a bubble of air in a water bottle, the water is being pulled down by gravity and the air is being pulled down by gravity – and water pushes the air out of the way. There are some funny tricks because of this fact. The water pushes the air out of the way, but the air ... 1- Make a Cut and Repair the Tape. The most common and effective method is to cut out the bubbled section of the tape with a utility knife and remove the tape to check the bubbles. If there are bubbles throughout, remove the entire tape. Then apply a new layer of joint compound (mixed with water to a creamy consistency) using a 6-inch knife and ... The super thin membrane creating the air bubble. The AirBubble monitoring system integrates urban air pollution sensors and is connected to a data processing platform capable of comparing measurements in real time and of highlighting the Air Quality Index for six core pollutants: fine particulate PM2.5 and PM10, ground level Ozone (O3), Nitrogen Dioxide (NO2), Sulphur …Air Bubble - DND 5th Edition. Source: Spelljammer: Adventures in Space - Astral Adventurer's Guide. 2nd-Level Conjuration. Casting Time: 1 action. Range: 60 feet. …air bubble: 1 n a bubble of air Type of: bubble a hollow globule of gas (e.g., air or carbon dioxide)Small bits of dust or lint often cause air bubbles, as can the oil from our fingerprints. So, if your device screen had fingerprints, or you touched the adhesive as you applied the protector, this is likely the cause of the air bubbles. Unfortunately, an air bubble can appear many months later, even if you applied the screen protector like a pro.Apr 15, 2021 · This Air Bubble Machine, aka Air Cushion Machine or Air Pillow Maker, is an easy-to-use system that allows you to produce air cushions on demand. Also, great for large volume goods, packaging wine bottles, glass products, ceramics, and fragile items. I traveled to the Bahamas to experience the 'resort bubble' at Baha Mar. Here's what my stay was like. Since the initial, near-total shutdown of travel when the coronavirus pandemi...Jun 5, 2023 · Step 4: Reapply the Tempered Glass Screen Protector. Align the edges of the tempered glass screen protector with the device screen, ensuring that the camera and home button (if applicable) are properly positioned. Slowly lower the protector onto the screen, allowing it to naturally adhere while minimizing the introduction of air bubbles. From Astral Adventurer's Guide, page 22. 2nd-level conjuration Casting Time: 1 action Range: 60 feet Components: S Duration: 24 hours You create a spectral globe around the head of a willing creature you can see within range. The globe is filled with fresh air that lasts until the spell ends. If the creature has more than one head, the globe of air appears around only one of its heads …The plume of air bubble curtains in still water is the most basic and pure dynamic process. To grasp its dynamic characteristics provides basis and reference for more complex plume movement in dredging engineering. Taking the formation process of a bubble plume in a flume as the research object, the characteristics of bubble formation …Speaking about the new modus operandi, Hardeep Puri said on Thursday, “Until international civil aviation can reclaim its pre-COVID numbers, the answer will lie in …The big bubble is back. Nike is re-issuing the original Air Max 1 we know and love, but re-worked to appear as it did in 1986. The 1987 Air Max 1, as well as the Air Max lineage in general, is a ...Injection molding air bubbles are a common issue that can occur during the manufacturing process, posing significant challenges to product quality. These tiny air pockets, if left unchecked, can lead to various defects and imperfections, compromising the integrity and functionality of injection-molded parts. To ensure high-quality, defect-free products, it is …Bubbles was relieved to find that Crosby had returned safely, considering that he nearly sent his wife a letter about his death. Thankfully, he didn't send it before his arrival. Now, as the team ...In the fast-paced world of e-commerce, customer satisfaction is paramount. When customers receive their packages in perfect condition and with a delightful unboxing experience, the...Air Bubble - DND 5th Edition. Source: Spelljammer: Adventures in Space - Astral Adventurer's Guide. 2nd-Level Conjuration. Casting Time: 1 action. Range: 60 feet. …Jun 26, 2023 · Air embolism is a gas bubble trapped within a vein or artery that can block the blood supply and cause serious damage to the central nervous system. It can be life-threatening and requires recompression in a hyperbaric chamber. Learn about the causes, symptoms, diagnosis and prevention of air embolism from diving, medical procedures or other factors. AirBubble is capable of absorbing 97% of the nitrogen and 75% of the particulate matter in the air. Early data collected in May 2021 shows concentrations of PM2.5 within the playground have fallen ... Air Bubble. Source: Spelljammer: Adventures in Space - Astral Adventurer's Guide. You create a spectral globe around the head of a willing creature you can see within range. The globe is filled with fresh air that lasts until the spell ends. If the creature has more than one head, the globe of air appears around only one of its heads (which is ...
It's going to happen, folks, if it hasn't already happened for you. You're going to step out of your pandemic-induced bubble -- hopefully still masked-up, but perhap.... My handr block login
The air bubble bags for packing is designed to anti prompt critical shock during the transportation, absorb the shock energy by expanding the film, but not break up. The LDPE based packing air bubbles are crystal clear, and with the customized logo print, that will- increase opening impression a lot. While the HDPE based film could be very thin ...This is because doughs have more flour than water, while batters have more water than flour. Doughs also tend to be simpler in terms of ingredients, often consisting of just flour, water, leavener, and salt. Many batters have several additional ingredients, including eggs, sugar, flavorings, and various sources of fat (butter or oil, milk, the ...Quick Picks: Top Choices For The Best Aquarium Bubbler and Air Stones. Aqueon Flexible LED Bubbler Wand. Penn Plax Aquarium Air Stone. Micro Oxygen and CO₂ Bubble Diffuser. Pawfly Four-Inch Air Stone Disc Bubble Diffuser. Aqueon Multi-Color Flexible LED Bubble Wand. WINOMO Bubble Wall Air Stone Tube. AQUANET …As a new generation of day traders tries its luck in the stock market, centuries of financial history show we should be paying close attention to the boom. Discover Editions More f...As stated in Bernoulli’s principle, the pressure within the contracted section of the air stream drops, which pulls the surrounding water inwards, further narrowing the air passage. Eventually, the two sides meet, and bubbles are pinched off from the air jet. From these two cases, we can see why the Rayleigh-Plateau and Kelvin-Helmholtz ...Air-Powered. Aerators. Connect to a compressed air line. The notches at the base create small bubbles for uniform aeration. Also known as a diffuser and an air bubbler, it is often used in wastewater treatment. For technical drawings and 3-D models, click on a part number. Lg. Max. Pressure.Microbubble. Microbubbles are bubbles smaller than one hundredth of a millimetre in diameter, but larger than one micrometre. They have widespread application in industry, medicine, [1] life science, [2] and food technology. [3] The composition of the bubble shell and filling material determine important design features such as buoyancy, crush ...Bubbles O2 Air Mineral Semula Jadi (800ml). RM4.00. 1 in stock. Add to cart. SKU: 100033511 Category: Minuman. Description; Additional information; Reviews (0). Microbubble. Microbubbles are bubbles smaller than one hundredth of a millimetre in diameter, but larger than one micrometre. They have widespread application in industry, medicine, [1] life science, [2] and food technology. [3] The composition of the bubble shell and filling material determine important design features such as buoyancy, crush ... When put together, "pneumomediastinum" refers to a condition in which air moves outside the lungs or airways and into the chest. Simply put, it is an air bubble inside of the chest. A pneumomediastinum is a rare occurrence. It is predominantly seen in men, with 76% of pneumomediastinum cases being in men. A pneumomediastinum can be caused by a ... Air Bubble brings you The Worlds Cleanest and Freshest Air. Air that is filtered and purified from its remarkable journey beginning in Antarctica, chilled over the great ice cliffs, prevailing wind currents move for thousands of kilometres across the southern ocean without crossing any landmass until reaching the pristine natural shores of Australia’s iconic Island of Tasmania. Our collection of Sealed Air bubble rolls and wrap feature different dispense methods as well as material options, so you'll be able to find a selection that works for your packing, shipping or storing needs. If you're shipping large items, consider bubble rolls and wrap in 72"W x 1250'L or 48"W x 250'L sizes to accommodate your packing needs.Specifications. Electrical Input: 110V to 240V VAC, 50/60 Hz - Consumption: 1800 Watts (VA) max. Please contact Pro Pac or call 888-318-0083 for your protective packaging equipment. Sealed Air Bubble Wrap Universal Inflation System runs over 80 types of Bubble Wrap brand materials on demand. Pro Pac offers air pillow and bubble protective ...Reproduced from Figure 5.16 of ref. 3. Open in viewer. That the bubble wake is still stable at the onset of path instability is typical of liquids characterized by a low value of the Morton number Mo ≡ Bo3 / Ga4 = … AIR BUBBLE definition: 1. a ball of air that is surrounded by a liquid or by soft or frozen material: 2. a ball of air…. Learn more. Air bubbles can create irregularities and disturbances on the surface of the candle, which can adversely affect the overall impression. It can appear as small or large pockets in the wax, making the candle look unsmooth and unprofessional. Clarity and Transparency. Air bubbles in the wax can affect the passage of light through the candle.The gentle, embracing massage of warm air bubbles. When you choose a Pure Air® bath, you give yourself the caressing sensation of warmed air inside thousands of bubbles. Air jet bathtubs offer a gentle, full-body experience — and a pure pleasure. Small air bubbles provide soothing massage while 360° air inlets ensure a whole-body experience ...The gentle, embracing massage of warm air bubbles. When you choose a Pure Air® bath, you give yourself the caressing sensation of warmed air inside thousands of bubbles. Air jet bathtubs offer a gentle, full-body experience — and a pure pleasure. Small air bubbles provide soothing massage while 360° air inlets ensure a whole-body experience ....