Why does the water leak out when the water in the bottle is turned upside down?

One is that water is subject to gravity, and the atmospheric pressure you said not only exists outside the bottle, but also exists in the bottle, otherwise the bottle would have been flattened by the atmospheric pressure outside, so the atmospheric pressure inside and outside cancel each other, which is equivalent to water only being affected by gravity, so it will flow down, hehe.

The water will flow and will not form a complete force surface, and if the bottle mouth is small, it may not leak out.

The first thing to understand is what pressure does on water. At the same point, the pressure is perpendicular to the surface of the object, acting on the object from all directions. In other words, the water inside the bottle is subjected to downward pressure at the top and upward pressure from the bottom, and the pressure in these two directions is approximately equal.

cancel each other out. But the water is also subjected to downward gravity. When the mouth of the bottle is facing downwards, this force is counteracted by no other force.

Under gravity, the water is left behind.

Water is fluid, so that air can string through it into the bottle, so that the pressure inside and outside is the same, so that the water flows out under the action of gravity.

Yes, but the bottle is also a standard atmospheric pressure, the inside and outside air pressure is the same, but the water has a gravitational effect, and after the analysis of the force, the water will inevitably fall.

For beer and carbonated drinks, CO2 gas is added to the pressure and is ejected even if it is shaken.

You don't pour slowly, there is air coming in or a little water leaking, remember to make sure the water is full!

You also have a standard atmosphere in your body, why would you point it down in the air?

It's a truth.

Since the bottle is filled with water and all the air is discharged, and the atmospheric pressure can support a column of water about 10 meters high, the water in the bottle will not flow out due to the atmospheric pressure when it is placed upside down in the tank.

The atmosphere exerts gas pressure in all directions to any object inside it, and the sink exerts atmospheric pressure on the water bottle and is greater than the pressure of the liquid inside the bottle, thus blocking the liquid inside the bottle from flowing out. A standard atmosphere can be as strong as the pressure produced by water at a depth of meters. po=7600mmhg

1. There is a condition, fill the mouth of the water bottle with water and then cover it with a glass piece (cardboard pieces can also be used), and then press and hold the thin sheet of the bottle mouth to turn it upside down in the air, and the water in the bottle will not flow out at this time.

2. Reason: The atmosphere should exert gas pressure in all directions on any object inside it, and the atmospheric pressure should also be applied to the thin sheet at the mouth of the bottle, and it should be greater than the pressure of the liquid in the bottle on the thin sheet, so as to block the liquid in the bottle and not flow out.

3. Note: A standard atmospheric pressure can be as strong as the pressure produced by water at a depth of meters. po=7600mmhg

This is because the pressure generated by the water in the glass bottle at the mouth of the bottle is the same as the pressure generated here on the outside.

Because the pressure in the water is greater than the pressure in the water in the glass bottle.

01 When the bottle is filled with water, there is no air. When the bottle is turned upside down again, the water in the bottle cannot withstand the air pressure from the bottle, but there is atmospheric pressure outside the mouth of the bottle. So when the water is flowing outward, the air can only slowly get into the bottle, and the water can only flow out slowly.

When you fill a thin bottle with water and turn it upside down, you will find that the water in the bottle does not flow out all at once, but flows out one at a time. At the same time, you can hear the sound of "tom, tom". Why is that.

First of all, there must be a problem with pressure, but it can't flow out when it is buckled to the sink, I think it is because the water bottle and the water in the sink are a whole, and this whole receives the downward pressure of the air on it. The water as a whole is bound by the walls of the container, so the water from the water bottle cannot flow out. Because the only way to flow is upward, and the water itself cannot flow upward, and the air pressure prevents the water in the sink from rising.

However, if the height of the water bottle is higher than 10 meters (that is, the pressure is greater than the air pressure), it can flow out, and the liquid level can rise.

If the water bottle is turned upside down, the water will flow out even if it is filled with water, that is, the inside is cut off from the air. It should be related to fluid mechanics, although the pressure of water is not as large as the air pressure, but at the mouth of the bottle, the contact surface between water and air is relatively large, and the characteristics of water flow will stay.

Just like when hanging a bottle, there are often bubbles wrapped in liquid in the plastic tube, instead of the air layer rising to the highest point, which should be related to the size of the contact area and the tension of the liquid.

Using the siphon principle, in the case of water in the basin, the water in the inverted bottle can not be left, and after the water in the basin is absorbed and evaporated, the air can enter from the mouth of the bottle, and the water will flow out, and when the water in the basin reaches a certain depth, it is blocked from entering the air in the bottle, and the water will not flow out again.

Siphon is the use of the liquid level height difference force phenomenon, after filling the liquid into an inverted U-shaped tubular structure, the high end of the opening trouser mouth is placed in a container filled with liquid, and the liquid in the container will continue to flow out through the siphon to a lower position, from the Song Dynasty Su Shi's "Dongpo Zhilin". The essence of siphon is due to the pressure of the liquid and the pressure of the atmosphere.

Siphon principle. The liquid at the highest point in the pipe moves to the low nozzle under the action of gravity, and generates negative pressure inside the U-shaped pipe, resulting in the liquid at the high nozzle being sucked into the highest point, because the air pressure on both sides is basically the same, the depth of the high nozzle is much lower than the depth of the low nozzle extending into the liquid surface, so the pressure at the low nozzle is greater than the pressure at the high nozzle from the nozzle.

However, the liquid will still flow from the rock mill to the low container. This phenomenon occurs because the pressure is only transmitted to the upper surface of the liquid. Therefore, although the pressure of the tube in the lower cup is higher, it cannot be transmitted to the high cup, so it cannot prevent the liquid from falling.

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.

This is made using the principle of pressure. Because the cup is covered with paper, it does not enter the cup when the outside air is poured upside down. The pressure of the atmosphere is much greater than the pressure of the water on the paper, so the water does not come out.

Specific analysis: filled with water, there is no air in the cup, cardboard lid, upside down can be considered that the cup filled with water and the vacuum cup have the same properties. At this time, on the one hand, the gravitational pressure of the cardboard by the water has a tendency to decrease;

On the other hand, it tends to be lifted by the pressure of the air from below, and the water in your cup, no matter how big, will not be as high as 160 mm Hg or 9.8 meters. So the external pressure must be greater than the gravity of the water in the glass, so it is pressed by the pressure of the air above.

Extended Information: Life Experiment Proves the Existence of Atmospheric Pressure Experiment 1: Simulating the Magdeburg Hemisphere Experiment Two leather bowls are squeezed mouth-to-mouth, and then both hands are pulled outward, and it is found that it takes a large force to pull it apart.

The common point between the Magdeburg hemispheric experiment and the simulation experiment is that the air in the metal ball and the leather bowl is pumped out or extruded, so that the pressure of the air in the metal ball and the leather bowl is reduced, and the atmospheric pressure outside presses them tightly together, and it takes a large force to pull them apart, which strongly proves the existence of atmospheric pressure.

Experiment 2: The "bottle swallowing egg" experiment uses peeled cooked eggs to block the mouth of the jar, and the eggs cannot be pressed into the bottle completely with gentle force by hand before the experiment. Then throw the lit cotton ball into the bottle filled with fine sand (to prevent the bottom of the bottle from bursting), quickly plug the hard-boiled egg into the bottle, and when the fire is extinguished, observe the egg "pop" and fall into the bottle.

In the above experiment, because the air pressure in the bottle is increased due to the burning of cotton, and the air pressure will be rapidly reduced by quenching, when the pressure in the bottle is less than the atmospheric pressure outside the bottle, the egg is pressed into the bottle under the action of atmospheric pressure. The "bottle swallowing egg" indicates that there is pressure in the atmosphere vertically downward, and the "cup-covering experiment" indicates that there is pressure in the atmosphere upward. Thus it shows the characteristics of atmospheric pressure:

The atmosphere has pressure in all directions.

on 2020-06-15

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Ad. Fill 1 cup with water, cover the rim with paper, and then turn the cup upside down, but the water will not flow out.

Respond within 5 minutes |10,000 professional answers.

Quick questions. The most beautiful fireworks are consulting an emotional issue.

Answer: (1) The container with the upper end open and the lower part connected is called the communicator, and the device does not conform to the characteristics of the communicator, so it is not a communicator;

2) When the bottle filled with water is put into the water of the bonsai, the water in the bottle will not flow out because the atmospheric pressure acts on the water surface of the rock mu in the bonsai; When the coarse Pisen water grip sedan chair in the bonsai due to evaporation and the absorption of the bonsai, the water surface drops and the bottle mouth is exposed, a part of the air enters the bottle, and the air pressure in the bottle becomes larger, then the water in the bottle will flow outward, once the bottle mouth is flooded again, the water in the bottle stops flowing out, so that the water in the bonsai can maintain a certain height

3) When the water in the bottle no longer falls, at this time, for the bottle mouth A point, the external air pressure and the internal pressure are equal, because the outside atmospheric pressure is unchanged, so, every time the water no longer falls, the pressure of the bottle mouth A point is always equal to the outside atmospheric pressure, that is, the pressure at the bottle mouth A point is unchanged;

So the answer is: (1) no; (2) evaporation; into the air; (3) unchanged;