What is the principle of the inverted cup without leakage

When the cup is filled with water and upside down, the paper isolates the air, and the water and the paper are in close contact, then the atmosphere will put pressure on the paper, and the cup will not leak when it is upside down.

The ratio of the pressure to the area of force on an object is called pressure, and pressure is used to compare the effect of pressure, the greater the pressure, the effect of pressure.

The more obvious. The formula for calculating the pressure is: p=f s, and the unit of pressure is pascal.

The symbol is PA.

The methods of increasing the pressure are: increasing the pressure under the condition that the force area is constant, decreasing the force area under the condition that the pressure is not changing, or increasing the pressure and decreasing the force area at the same time. There are ways to reduce the pressure:

Decrease the pressure while the force area remains the same, increase the force area with the same pressure, or reduce the pressure and increase the force area at the same time.

On top of a cup filled with water, there is a piece of cardboard that is as hard as a postcard, and if you turn the cup upside down, the paper does not fall because the water molecules squeeze against each other, causing the surface tension to decrease. The reason why water does not leak out is that the pressure exerted by the water in the cup on the paper is equal to the atmospheric pressure (atmospheric pressure) that the paper is subjected to, and the balance is reached.

When the cup is filled with water, the air is isolated from the intimate contact between the water and the paper, and at this time, the atmosphere will not leak to Zhang Shiya's cup.

In this way, the cardboard will separate the air, and of course the water will come into close contact with the paper, and then the atmosphere will put pressure on the paper, and of course the cup will not leak water.

Because, the air is separated, and the water and the paper come into contact together, and then the dog will put pressure on the paper, so the cup is upside down and the water does not leak.

The air in the round cup is gone, so turn the cup upside down, and the atmosphere outside is so um.

Because the water keeps the air out.

The experimental process of the cup handstand without leakage is as follows:1. Fill the cup with water, (the liquid level is level with the mouth of the cup).

2. Cover with a piece of paper (no bubbles).

3. Press and hold the cup with your hand and slowly turn the cup upside down, so that the water will not leak out.

IntroductionBecause there is no air in the cup, the outside atmospheric pressure is greater than the inside, and the weight of water is not as strong as the outside atmospheric pressure, so the outside atmospheric pressure holds both the water and the cardboard.

The surface tension of the water causes the cup and paper to close completely. At this time, the pressure of the water in the cup on the paper is less than the atmospheric pressure outside the cup, so the atmospheric pressure helps the paper to hold the water.

Due to the existence of atmospheric pressure, the paper will be subjected to an upward "support" effect of atmospheric pressure, therefore, water and paper will not fall, when the bottle is filled with water, there is no air in it, and there is no atmospheric pressure in the bottle, only the pressure of water.

1. The principle of atmospheric pressure is that the cup is upside down and does not leak, and we are surrounded by the atmosphere, which is under pressure, and the pressure is huge.

2. Fill the cup with water and cover it with cardboard, so that between the cup and the cardboard is water, and there is only very little air.

3. The external atmospheric pressure presses the paper and clings tightly to the cup, so the water cannot flow down.

When the cup is filled with water and upside down, the paper isolates the air, and the water and the paper are in close contact, then the atmosphere will put pressure on the paper, and the cup will not leak when it is upside down.

Pressure: The ratio of the pressure to the area of force on an object is called pressure, and pressure is used to compare the effect of pressure, the greater the pressure, the more obvious the effect of pressure. The formula for calculating pressure is:

p=f s, the unit of pressure is pascal, and the symbol is pa. The methods of increasing the pressure are: increasing the pressure under the condition that the force area is constant, decreasing the force area under the condition that the pressure is not changing, or increasing the pressure and decreasing the force area at the same time. The methods of reducing the pressure are to reduce the pressure while the force area remains the same, increase the force area under the same pressure, or reduce the pressure and increase the force area at the same time.

The fact that the cup is upside down and does not leak is based on the principle of pressure in physics.

The physical phenomenon that the glass filled with water is covered with paper and turned upside down, and the paper does not fall, which is due to the atmospheric pressure holding the paper. This is the most common experimental phenomenon in the presence of atmospheric pressure, and the reason why the paper does not fall off is because it is affected by the external atmospheric pressure.

Blow air into the middle of the two drooping sheets, the air flow velocity in the middle of the two sheets of paper is large, the pressure becomes smaller, the pressure on the outside of the paper remains unchanged, and the two sheets of paper are closed to the middle under the action of the pressure difference between the inside and outside. This means that the higher the velocity of the gas, the lower the pressure.

Experimental method of water leakage when the cup is turned upside down:

The cup must be filled with water first, and the surface tension should be used so that the water surface is as high as possible above the rim. Then slowly cover the cardboard over the cup and let the water soak in, leaving no gaps in the oranges. Then turn the cup upside down.

In the process of pouring, first press the cardboard with one hand, hold the bottom of the cup with the other, lift it quickly upwards as a whole, and quickly turn the cup upside down before the inertia of the upward movement of the water disappears. Release the hand that is pressing the cardboard, and the atmospheric pressure will hold the cardboard in place. As long as no air leaks in, it can last for quite a long time.

The scientific principle is that the piece of paper is in a state of force equilibrium at this time.

The paper piece is subjected to its own gravity and the pressure of the water in the cup, and these two forces form a resultant force in one direction, vertically downward.

f1。Depending on the surface tension of the water, the paper is subjected to an upward pulling force. Since the piece of paper is in the atmosphere, the piece of paper is also subjected to atmospheric pressure, which is vertically upward, forming a resultant force f2 with the tensile force.

F1 and F2 are equal in magnitude and opposite directions, so the forces are balanced. Because the paper is affected by the surface tension of the water, it is completely closed in close contact with the mouth of the cup, so the paper continues to maintain the balance of force, and naturally keeps the water in the cup and the water will not leak out.

It is because it is on duty, and it is in a state of force balance at this time.

Hello dear, the principle of water not leaking when the cup is turned upside down is the principle of air pressure. When the cup is filled with water and the rim is covered, the air pressure inside and outside the cup balances so that the water in the cup does not flow out. When the cup is turned upside down, the water in the cup forms a hollow surface of the water.

At this point, the air inside the cup cannot enter the cup, creating an enclosed space. Since the bottom of the cup is a flat surface that is sealed and teased, the water molecules at the bottom of the cup will move downward by gravity, but since the air pressure inside the enclosed space is lower than outside, the air pressure will keep the water molecules at the bottom of the cup so that the water does not flow out. If the cup is tilted so that the mouth of the cup is connected to the outside world, there is a difference in air pressure between the inside and outside of the cup, and the water in the cup will flow out of the mouth.

Therefore, the condition that the cup is upside down and the water does not leak is that the air pressure inside and outside the cup must be equal, so that Shan Hongqing forms a closed space.

The area of the rim multiplied by the atmospheric pressure is the maximum weight that can be withheld, which is converted into mass. So if the mass is greater than that, the occlusion will fall. You're right.

The pressure of the water in the cup on the piece of paper is less than the atmospheric pressure outside the cup, so the atmospheric pressure helps the piece of paper hold the water.

The Horror Achievement is the maximum weight that can be borne by atmospheric pressure, and it is enough to replace it with mass, so the mass is greater than this shelter and it falls.

Reason: Multiply the area of the main mouth. Atmospheric pressure is the maximum weight that can be withheld, which is converted into mass.

It has been learned that the water in the cup is in equilibrium with the atmospheric pressure, but if the paper that seals the mouth of the cup is replaced with an object of a certain mass (), can it still be kept without leakage?

The reason is that there is an atmospheric pressure.

Because of the air pressure, the cup will not fall down.

It's because the air inside the water is in balance with the outside.

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It's not a math problem. It's physical. Atmospheric pressure. The prerequisite is that your cup cannot exceed twelve meters in length.