Barometer

Barometer is an instrument that we can used to measure atmospheric pressure.

barometer

A long glass tube is sealed at one end and then filled with Liquid Mercury metal. The filled tube is then turned upside down and inserted into a bowl of mercury, called a cistern. When this happens, a small amount of mercury runs out of the tube into the cistern, leaving a vacuum at the top of the tube. Vacuums, by nature, exert very little or no pressure on their surrounding environment.

Types of Barometer;

There are two types of Barometer.

Aneroid Barometer

Mercury Barometer

The Average Sea Level Pressure is;

• In Psi = 14.7

• In Kpa = 101.325

• In mm of Hg = 760

• In Inches of Hg = 29.92

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