Boyle's Law states that the volume given sample of gas at constant temperature varies inversely with the pressure.

Charles' Law

The pressure that a gas exerts on the walls of its container is determined by the momentum of the atoms and molecules of the gas, which in turn is determined by the temperature. As the temperature increases the atoms and molecules move faster, and so exert a greater pressure on the walls. If the walls are rigid, such that the volume of the container is held constant, then the relationship between pressure P and temperature T is given by Charles' Law

 

Avogadro’s Law

 

Discovered by Amedo Avogadro, of Avogadro's Hypothesis fame, probably sometime in the early 1800s. Gives the relationship between volume and amount when pressure and temperature are held constant. Remember amount is measured in moles. Also, since volume is one of the variables, that means the container holding the gas is flexible in some way and can expand or contract. If the amount of gas in a container is increased, the volume increases.If the amount of gas in a container is decreased, the volume decreases.

 

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Ideal gas law