What Is The Formula For Gay-Lussac’s Law?

Gay-Lussac's Law is used at constant volume, so don't use this gas law for balloons!
Gay-Lussac's Law is used at constant volume, so don't use this gas law for balloons!. Tetra Images - Jessica Peterson, Getty Images

Question: What Is The Formula For Gay-Lussac’s Law?

Gay-Lussac’s Law is a special case of the ideal gas law. This law only applies to ideal gases held at a constant volume allowing only the pressure and temperature to change.

Answer: Gay-Lussac’s Law is expressed as:

Pi/Ti = Pf/Tf

where
Pi = initial pressure
Ti = initial absolute temperature
Pf = final pressure
Tf = final absolute temperature

It is extremely important to remember the temperatures are absolute temperatures measured in Kelvin, NOT °C or °F.



Worked Gay-Lussac’s Law Example Problems

Guy-Lussac's Gas Law Example
Ideal Gas Law Example Problem - Constant Volume

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Helmenstine, Todd. "What Is The Formula For Gay-Lussac’s Law?" ThoughtCo, Mar. 16, 2017, thoughtco.com/formula-for-gay-lussacs-law-604282. Helmenstine, Todd. (2017, March 16). What Is The Formula For Gay-Lussac’s Law? Retrieved from https://www.thoughtco.com/formula-for-gay-lussacs-law-604282 Helmenstine, Todd. "What Is The Formula For Gay-Lussac’s Law?" ThoughtCo. https://www.thoughtco.com/formula-for-gay-lussacs-law-604282 (accessed May 21, 2018).