Regarding the volume-temperature relationship, Gay-Lussac attributed his findings to Jacques Charles because he used much of Charless unpublished data from 1787 – hence, the law became known as Charless law or the Law of Charles and Gay-Lussac.
Amontonss, Charles, and Boyles law form the combined gas law. These three gas laws in combination with Avogadros law can be generalized by the ideal gas law.
Gay-Lussac used the formula acquired from ΔV/V = αΔT to define the rate of expansion α for gases. For air, he found a relative expansion ΔV/V = 37.50% and obtained a value of α = 37.50%/100 °C = 1/266.66 °C which indicated that the value of absolute zero was approximately 266.66 °C below 0 °C. The value of the rate of expansion α is approximately the same for all gases and this is also sometimes referred to as Gay-Lussacs Law. See the introduction to this article, and Charless Law.