Question

According to Charles's law, the volume of a gas will decrease as temperature decreases (directly proportional). Theoretically, a gas will take up no volume when _______ has been reached.

Answer 1

The answer is; absolute zero

Absolute zero is the lowest theoretical levels of temperatures that can be achieved in a system in thermodynamics. Theoretically also, an ideal gas at these temperatures has zero entropy and enthalpy  (meaning that its molecules have negligible vibrational motion).