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Pressure is a force per unit area that acts on an object. It can be expressed simply as P = F/A, where F is a force, and A is the area it acts on. Pressure is often calculated for gases and fluids. The pressure under a liquid or gas is equal to the density of that fluid multiplied by the acceleration due to gravity and the height (or depth) of the fluid above the certain point. The unit for pressure is the Pascal (Pa),


【 在 laofu 的大作中提到: 】
: 这段英文不太严谨，的确有暗示空气压强和水的压强服从同样规律的嫌疑。实际上气压的变化虽然是高度引起的，但不是由于ρgh，而是较高的地方空气密度较小，气温也较低。
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