## Unit of Pressure – Class 11 | Chapter – 2 | Physics Short Notes Series PDF for NEET & JEE

Unit of Pressure: Pressure is defined as the force applied per unit area. It is a measure of how much force is acting on a given area. Pressure can be expressed in various units, including pascals (Pa), pounds per square inch (psi), atmospheres (atm), and bars (bar), among others.

## Unit of Pressure

The SI unit of pressure is the pascal (Pa), named after the French mathematician and physicist Blaise Pascal. One pascal is defined as the pressure exerted by a force of one newton (N) acting on an area of one square meter (m2).

Other commonly used units of pressure include:

• Bar (bar): One bar is equal to 100,000 pascals (105 Pa).
• Atmosphere (atm): One atmosphere is approximately equal to the average pressure of the Earth’s atmosphere at sea level, which is equivalent to 101,325 pascals (1.01325 x 105 Pa).
• Millimeter of mercury (mmHg): One millimeter of mercury is equal to the pressure exerted by a column of mercury that is one millimeter high and has a density of 13.5951 grams per cubic centimeter. One mmHg is approximately equal to 133.322 pascals.

There are many other units of pressure that are used in specific industries or regions, but the pascal is the SI unit and is used internationally as the standard unit of pressure.

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