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压力(又称压强),是一个广泛应用的物理量。定义为垂直均匀地作用于单位面积上的力。过去,由于多种原因,人类产生和采用了多个压力计量单位。常用者亦有六、七种之多。如:米制的公斤力/厘米~2(kgf/cm~2,工程大气压),毫米汞柱(mmHg),毫米水柱(mmH_2O);时制的磅力/吋~2(bf/in~2或Psi),吋水柱(inH_2O),以及atm(物理大气压)、巴(bar)等等。这些单位有的属于绝对单位制,有的属于重力单位制,适用于不同的领域。物理学中通常采用atm及达因/厘米~2(dyn/cm~2)为压力单位,而工程技术上多采用kgf/cm~2、mmH_2O等为压力单位。加之重力
Pressure (also known as pressure), is a widely used physical quantity. It is defined as the force acting perpendicularly on unit area. In the past, multiple stress units were created and used by humans for a variety of reasons. Common users are also six or seven. Such as: kilograms of rice power / cm ~ 2 (kgf / cm ~ 2, the project atmospheric pressure), mmHg, mmH2O; pound force per square inch ~ 2 (bf / in ~ 2 Psi, inH2O, and atm, bar, and the like. Some of these units belong to the absolute unit system, others belong to the system of units of gravity and are applicable to different fields. Physics commonly used atm and dyne / cm ~ 2 (dyn / cm ~ 2) for the pressure unit, and engineering technology to use more kgf / cm ~ 2, mmH_2O as the pressure unit. Coupled with gravity