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Pressure Definition

Chemistry Glossary Definition of Pressure

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Gas exerts pressure on a balloon, causing it to expand when you blow it up.

Gas exerts pressure on a balloon, causing it to expand when you blow it up.

Paul Taylor, Getty Images
Pressure Definition: Pressure is a measure of the force applied over a unit area. Pressure often is expressed in units of pascals or pounds per square inch. In equations, pressure is denoted by the symbol 'P'.

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