Question

Почему давление атмосферы нельзя рассчитать так же, как рассчитывают давление жидкости на дно сосуда??

Answer 1

Потому что давление это сила, деленная на площадь поверхности. Если у дна сосуда ты можешь посчитать площадь поверхности, то у Земли - нет

Answer 2

Why Atmospheric Pressure Cannot Be Calculated Like Liquid Pressure on the Bottom of a Vessel

Atmospheric pressure and liquid pressure on the bottom of a vessel are calculated differently due to the fundamental differences in the nature of gases and liquids.

Atmospheric Pressure: Atmospheric pressure is the force exerted by the weight of the air above a given point. It is caused by the gravitational attraction of the planet on the atmospheric gases above the surface. The pressure decreases with increasing altitude due to the decreasing weight of the air column above.

Liquid Pressure on the Bottom of a Vessel: The pressure exerted by a liquid on the bottom of a vessel is determined by the depth of the liquid and the density of the liquid. This pressure is calculated using the formula P = ρgh, where P is the pressure, ρ is the density of the liquid, g is the acceleration due to gravity, and h is the depth of the liquid.

Differences: 1. Nature of Substance: Gases and liquids have different physical properties. Gases are compressible, while liquids are generally considered to be incompressible. 2. Density and Weight: The density of gases changes with altitude, while the density of a liquid remains relatively constant. This means that the weight of the column of gas above a point changes with altitude, affecting the atmospheric pressure, whereas the weight of the liquid column remains constant, affecting the pressure at the bottom of the vessel.

Conclusion: Due to these fundamental differences in the nature of gases and liquids, the calculation of atmospheric pressure and liquid pressure on the bottom of a vessel follows different principles and formulas.