Pour hot water into the bottle, shake it, then pour it out and tighten the bottle cap. What is the phenomenon that the bottle will deflate?

Because the pressure in the mineral water bottle from which hot water is poured is less than the external atmospheric pressure, the mineral water bottle is crushed under the action of atmospheric pressure, so this phenomenon proves the existence of atmospheric pressure;

Because mineral water bottles are subjected to atmospheric pressure, force can change the shape of objects, which also shows that force can change the shape of objects.

Extended data:

Atmospheric pressure is related to altitude, atmospheric temperature and atmospheric density, and generally decreases exponentially with altitude. The air pressure changes every day and every year.

In a year, the air pressure in winter is higher than that in summer. In a day, the air pressure has a maximum value and a minimum value, which appear at 9 ~ 10 and 15 ~ 16 respectively, and the second high value and the second low value appear at 2 1 ~ 22 and 3 ~ 4 respectively.

The daily variation of air pressure is small, generally 0. 1 ~ 0.4 kPa, and decreases with the increase of latitude. The change of air pressure is closely related to wind and weather, so it is an important meteorological factor.

The commonly used units of air pressure are Pa, mmHg and millibar. The conversion relationship between them is:100pa =1mbar ≈ 3/4 mm mercury column height. Commonly used instruments for measuring atmospheric pressure in meteorological observation include mercury barometer, empty box barometer and barometer.

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