Gases :  Laws

Boyle's Law
 The Pressure (P) of a gas is inversely proportional to Volume (V) at constant Temperature (T) and moles of gas (n). Robert Boyle The product of pressure and volume of one measurement is equal to the product  of the pressure and volume of another measurement.                                P1V1 = P2V2

Amonton's Law
• The Pressure of a gas is directly proportional to the Temperature (Kelvin) at constant V and n.
• Absolute Zero - The temperature (-273.15 C or 0 K) at which the volume and pressure of an ideal gas extrapolated to zero.
• Definition proposed by Joseph Lambert in 1779
where TK is measured in Kelvin and ToC is measured in Celsius

Charles' Law
 The Volume of a gas is directly proportional to the Temperature (Kelvin)  at constant P and n. Jacques-Alexandre- César Charles

Gay-Lussac's Law(law of combining volumes)
 The ratio of the volumes of gases consumed or produced in a chemical reaction is equal to the ratio of simple whole numbers (coefficients in the balanced equation).  e.g.  Carbon monoxide combines with oxygen in a 2:1 ratio by volume Joseph Louis Gay-Lussac