压力

压力（符号：P 或 p）是力与该力分布的面积之比。压力是单位面积上垂直于物体表面的力。表压（也拼写为 gage pressure）[a] 是相对于当地大气或环境压力的压力。压力的单位是任何单位的力除以任何单位的面积。压力的国际单位制单位是牛顿每平方米，它以十七世纪的哲学家和科学家布莱兹·帕斯卡尔命名为帕斯卡（Pa）。1 Pa 的压力很小；它大约等于一张平放在桌子上的美元纸币施加的压力。日常生活中常用千帕（1 kPa = 1000 Pa）来表示压力。

Pressure (symbol: P or p) is the ratio of force to the area over which that force is distributed. Pressure is force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure (also spelled gage pressure)[a] is the pressure relative to the local atmospheric or ambient pressure. Pressure is measured in any unit of force divided by any unit of area. The SI unit of pressure is the newton per square metre, which is called the pascal (Pa) after the seventeenth-century philosopher and scientist Blaise Pascal. A pressure of 1 Pa is small; it approximately equals the pressure exerted by a dollar bill resting flat on a table. Everyday pressures are often stated in kilopascals (1 kPa = 1000 Pa).