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If the weight of the water is less than the air pressure inside of the test tube.
Try this on your friends. Fill a glass to the brim with water. Place a piece of flat cardboard over the rim of the glass. Place your hand over the cardboard and invert the glass. Take you hand away and the water will remain in the glass. Air pressure again come into play here.
Try this one as well. Place a small lighted piece of paper in to an empty plastic bottle or tin can. The lighted paper will burn up the air in the container and will eventually go out. Because there is now a partial vacuum in the container the outside air pressure will try to fill the space and will gradually crush the bottle or can.
Wiki User
∙ 16y ago
Wiki User
∙ 13y agoIt would depend on your experiment. A lid or stopper, a vacuum (and small hole), some kind of a water resistant membrane, seal it with grease or wax, a greased membrane...
A perfect vacuum can hold up 33.9 feet of water.
Wiki User
∙ 13y agoI'm not quite sure what your experiment is.
But, if you prevent air from entering a cup, then the water can not escape (up to a 34 foot column which gives the equivalent pressure of 1 ATM).
So, for example, you could take a cup full of water. Place a shallow bowl, or perhaps even a saucer on the cup, then invert it. A little water will escape during the inversion process, but once a seal is made with water around the base, no more water will come out because air is unable to get in through the layer of water.
An "automatic waterer" for small animals often works on the same principle. A jar full of water is inverted on a base. The base has a small air hole on a side (to control the level). If the air hole is submerged, then the water remains in the jar. Once the animal has drank enough water to expose the air hole, then an air bubble enters the jar, and more water is released.
Wiki User
∙ 14y agogravity? i have the sm qs on my lab. maybe density too. but idk
Wiki User
∙ 14y agoyou put a lid on the can and the water will not come out.
Wiki User
∙ 12y agoIt doesn't, otherwise the ocean would be fresh except for the bottom. Salt dissolves in water.
Wiki User
∙ 10y agoThe acid is more dense than the water
Wiki User
∙ 15y agoit floates
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Which scientist worked in the field of pressure?
Oxygen was discovered for the first time by a SwedishChemist, Carl Wilhelm Scheele, in 1772.
Does cold water stay colder in a plastic cup or a foam cup?
You're talking about holding the temperature of the water, right? As far as containing the liquid, they're about equal...but a styrofoam or double-wall plastic cup would hold temp better than a glass cup which would work better than a single-wall plastic cup.
How can you clean mold from a water jug inside?
If the mold inside a water jug is old or dried on, fill the jug with hot, sudsy water and let it stand for 20-minutes. Pour in 1/3 cup dry, uncooked rice and 1/3 cup baking soda. With the lid tightly closed, shake the bottle several time. The rice will loosen the mold and the baking soda will remove odors. Carefully open the lid, and pour the contents down the drain. Fill the jug half-full of hot water, a drop of dish soap, and shake well. Pour contents out and rinse thoroughly. Allow to air-dry upside down.
What objects have matter?
alot of objects have matter like the following: gas, water, hair, the sun, air. and sunshine doesnt have matter. air has matter because if you put an upside-down cup with a wad of paper in the bottom and you stick it in the water upside-down and when you take it out if you did it right then the paper is dry so that proves that air has matter
How many ounces in 1 cup water?
1 cup = 8 fluid ounces, regardless of what's in the cup. Even if it's empty.
How does water not spill out when glass covered with card board upside down?
When filling a cup/glass with full water the card/lid will not stay up.
How does a cup of water stick to a piece of cardboard?
You get a peice of cardboard fill a half cup with water and push the cardboard on top and turn it upside down
When a cup is filled with water with a card on top of it is turned upside down the water does not fall out why?
because the pressure on the inside is less than the pressure on the outside of the cup, so the card remains on the bottom of the cup when it is tipped over.
How is cupping done?
To create a vacuum, a flame from a lighter or a burning cotton ball is placed in an upside-down cup. When the oxygen in the cup is burned off, the cup is placed directly on the skin
Describe an experiment to show air has pressure?
1. Take a cup, and fill it about halfway with water. 2. Next cut a piece of paper big enough to cover hole of cup 3. Flip cup upside down securing it with your hand (do this over a sink just in case) 4. Now let go of paper and observe. The paper should stay in place because the air pressure is pushing up against it.
What do the Dairy Queen attendant do when they give the blizzard to the customers?
They turn the cup upside down to show you how thick the ice cream is.
What is the purpose of gravity free water?
how does the gravity free water stay inside the cup
How much water do you add to one bag of cement?
Start with one gallon. Mix the cement with a shovel. Sometimes you may have to add a little more water. You do not want to get it to thin and soupy because it will cause it to loose strength. For best results fill a plastic cup with the mixed cement. Turn the cup upside down and lift the cup up. The final mix should stand close to half the height of the cup.
If you put a cup of chlorine in 14 inches of water how long will it stay in the water?
that deep-ends on the volume of water
How long does it take for a flea to drown?
Fleas will stay alive on the surface of a cup of water for days. Most often they will crawl out and escape. They can even escape from the sink when you run the faucet on them. Push them down into the bottom of a cup of water and they will die within seconds due to the pressure of the water on their little flea lungs.
Science projects for kids?
A good one for air pressure in physics is to do an experiment circus where they are in pairs and go around the classroom trying out up to 5 different experiments. One is filling a coke can a third full of water, then heating until steam rises from the can and then using a clamp turn it upside down and into a basin of cold water. Watch the can be crushed by the difference in pressure. Another is filling a plastic cup full of water and placing a piece of card on top then turn the cup upside down and the card will stick. Then, you could try and pull apart two hemispheres in a vacuum.
How do you keep hot water hot in a cup?
try covering the glass, so the heat particles stay inside the cup, and the hot water stays hot.
