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Pressure

Pressure can be measured with an instrument called a manometer. The pressure is the result of force exerted upon the surface of an object:

p = FN / A

p ⇒ pressure [Pa], [N/m2]
A ⇒ area of the surface [m2]
V ⇒ volume [m3], [l]

Boyle-Mariotte Law

According to the Boyle-Mariotte law for ideal gases, the pressure of a gas is inversely proportional to its volume. For instance, if half the volume of gas is released from a compressed air tank, the pressure in the tank will only be half as large. It is described by the following formula:

p ∼ 1 / V

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