An empty bottle with a bottle stopper. Is the pressure inside the bottle equal to the atmospheric pressure outside the bottle? Why?Is the pressure of gas not different from that of atmospheric pressure?
The gas pressure and the atmospheric pressure is indeed different. However, does not mean that the two do not equal. The atmospheric pressure can be regarded as due to gravity, while the gas bottle is not as due to gravity. At this time, inside and outside pressure are equal.
The causes of the pressure of gas and liquid are different, and the microscopic explanation of the gas pressure in the high school is clear. The gas pressure is the impact force of gas molecules on the vessel wall, for example, pump when pumping, although the gas pump in the small, quality can be ignored, but it is difficult to compress, pressure is very large, is not caused by gravity. Moreover, the top of the gas has a pressure on the cap, which is unexplained by gravity.
Because the bottle does not inhale and does not deflate until it is in equilibrium, the internal and external pressures are equal. When the lid is applied, the temperature remains the same, the pressure remains constant, or the atmosphere is equal to the pressure
