When the external pressure is belowatmosphericpressure, the boiling point will be lower .
当外界压强低于一个大气压时,水的沸点就降低。
2
The deviation of sound above and belowtheatmosphericpressure levels is called Sound Pressure.
上述偏差的声音和大气压力下被称为声压水平。
3
The Fairchild Model 1600A Vacuum Regulator is designed for systems that require High Flow and system pressure control above and belowatmospheric pressure.