The Gas Laws  
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Boyle's law - The pressure of an ideal gas is inversely proportional to the volume of the gas at constant temperature.

Charles' law - The volume of an ideal gas is directly proportional to the thermodynamic temperature at constant pressure.

Pressure law - The pressure of an ideal gas is directly proportional to the thermodynamic temperature at constant volume.

Real Gases - A complete introduction to the Kinetic Molecular Theory and Ideal Gases must also mention Real Gases. Generally, chemists try to ignore real gas behavior. Since there are uncountable numbers of different real gases and each needs its own mathematical description, the task of describing real gases is very intimidating. What is meant by the term Real Gas? Scientists describe a real gas as any gas that significantly disobeys any part of the Kinetic Molecular Theory. As long as a gas has sufficiently high kinetic energy and has the particles spaced far enough apart, then that gas will usually behave like the Ideal Gas. There are two sections of Kinetic Molecular Theory that will always cause problems for chemists. The ideas that the particles are volumeless and that they do not interact with each other are common potential sources of error.

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