Which law states that the volume and absolute temperature of a fixed quantity of gas are directly proportional under constant pressure conditions? boyle’s law charles’s law dalton’s law gay-lussac’s law

Charles's Law i think

Answer is: Charles’s law.

Charle's law (the temperature-volume law): the volume of a given amount of gas held at constant pressure is directly proportional to the Kelvin temperature:  V₁/T₁ = V₂/T₂.  

For example:

V₁(gas) = 20.0 L; initial volume.

T₁(gas) = 280 K.; initial temperature

V₂(gas) = 10.0 L; final volume

T₂(gas) = ?; final temperature.

20.0 L/ 280 K = 10.0 L / T₂.  

T₂ = 140 K.  

As the volume goes down, the temperature also goes down, and vice-versa.