3.2 Atmospheric Pressure & Units of Pressure | SI & Non SI units of Pressure | Class 11 | Chemistry
Автор: Al-Farooq Academy
Загружено: 2024-09-08
Просмотров: 200
Units of Pressure:
The pressure of air that can support 760 mmHg column at sea level, is called one atmosphere. It is the force exerted by 760mm or 76cm long column of mercury on an area of 1cm' at 0°C.It is the average pressure of atmosphere at sea level ImmHg= Itorr. The S.I. unit of pressure is expressed in Nm?. One atmospheric pressure i.e 760 torr is equal to 101325Nm
1pascal = 1Nm*. So, 760 torr = 101325Pa = 101.325 kilopascals (kpa is another
unit of pressure)
The unit pounds per square inch (psi) is used most commonly in engineering
work, and 1 atm = 760 torr=14.7 pounds inch". The unit millibar is commonly used by metereologists.
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