相对压力是与周围空气的压力相比的压力。由于气压取决于海拔高度和天气，因此会因环境条件而异。过程工业中的大多数压力测量是指相对压力而不是绝对压力。

　　原文：

　　Relative pressure is pressure as compared to that of the surrounding air. As air pressure depends on the height above sea level and the weather, it varies depending on ambient conditions. Most pressure measurements in the process industry refer to relative rather than absolute pressure.