Temperature must be in Kelvin for the equation to work.
A graph of pressure vs. Gay-Lussac's Law shows the relationship between the Temperature and Pressure of a gas. With the addition of Avogadro's lawthe combined gas law develops into the ideal gas law:. For example, Gay-Lussac found that 2 volumes of hydrogen and 1 volume of oxygen would react to form 2 volumes of gaseous water. Gay-Lussac's law can refer to several discoveries made by French chemist Joseph Louis Gay-Lussac — and other scientists in the late 18th and early 19th centuries pertaining to thermal expansion of gases and the relationship between temperature, volume, and pressure.