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The Gay-Lussac law is the linear relationship between the volume \(V\) and the temperature \(T\) of an ideal gas with constant pressure. In a volume-temperature graph, it is a straight line. Thus, the ratio of volume to temperature is always constant:$$ \frac{V_1}{T_1} ~=~ \frac{V_2}{T_2} $$
By extrapolation of the straight line, the absolute zero (0 Kelvin) can be determined in degrees Celsius (-273.15 °C).