Question

which quantity is held constant when working with boyle’s, charles’s, and gay-lussac’s laws?

Answer 1

These laws are the most commonly known gas laws. Each law has it's own assumption but all of them assumes a constant amount of a particle in terms of moles. Boyle's law is about having constant temperature. Charle's law is on constant pressure and Gay-Lussac's Law is on constant volume.

Answer 2

I believe the answer is: Moles

The moles is symbolize with R , which is R' is the ideal gas constant ( of 0.0821 liter atmospheres per moles Kelvin).

In all equation related to ideal gas, pressures, volume, and temperature are the variables that most likely changed depending on the situation.