According to Charles' Law, how is the relationship of volume and temperature expressed?

The correct choice reflects the direct relationship between the volume and temperature of a gas, as stated by Charles' Law. This law posits that at constant pressure, the volume of a gas is directly proportional to its absolute temperature (measured in Kelvin). Mathematically, this is expressed as the ratio of the initial volume to the initial temperature equaling the ratio of the final volume to the final temperature (V1/T1 = V2/T2).

This relationship makes intuitive sense: as the temperature of a gas increases, the kinetic energy of its molecules also increases, causing the gas to expand and occupy a larger volume, assuming that the pressure remains constant. This principle is fundamental in understanding gas behavior in various environments and applications, illustrating how thermal energy affects gas volume.

Other options mention different relationships among pressure, volume, and temperature, but those do not align with the specific principles outlined by Charles' Law. For instance, combining volume and pressure equations applies to Boyle's Law, which addresses the inverse relationship between pressure and volume at constant temperature, while other incorrect choices do not correspond to established gas laws.