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6.4 Pressure Temperature Law

The Pressure and Temperature law is similar to Charles' law. It states that "For a given mass of a dry gas, the pressure is directly proportional to the absolute temperature, if the volume is kept constant."

It can be mathematically expressed as

P µ T, if V is constant

P = constant ´ T

This law can be useful in calculating the pressure of a gas at any required temperature if the pressure at some other temperature is known by using the following equation :

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If 25 dm3 of a gas at 36.5 KPa is cooled from 298 K to 136 K, keeping the volume constant, the final pressure can be calculated as follows :

P1 = 36.5 KPa / P2 = ?

T1 = 298 K T2     = 136 K

=       16.66 KPa

Index

6.1 The Gaseous States Properties
6.2 Boyle's Law
6.3 Charle's Law
6.4 Pressure - Temperature Law
6.5 Gay Lussac's Law
6.6 Avogadro's Law
6.7 Graham's Law of Diffusion
6.8 General Gas Equation

Chapter 7

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