Final answer:
Charles's law is the gas law that relates volume to temperature, stating that the volume of a gas is directly proportional to its absolute temperature, provided the amount of gas and the pressure remain constant. So, the correct answer in option 4.
Step-by-step explanation:
The gas law that relates volume to temperature is Charles's law. This law states that, at a constant pressure, the volume of a fixed amount of gas is directly proportional to its absolute temperature (measured in Kelvins). Therefore, if the temperature increases, the volume increases, and if the temperature decreases, the volume decreases, assuming the pressure and amount of gas are held constant.
Charles's law is represented by the formula V1/T1 = V2/T2, where V represents the volume and T is the temperature in Kelvins. This equation shows how the volume of the gas changes in relation to its temperature. Remember, for all gas laws, the temperature must be expressed in Kelvins to ensure the correct relationship is maintained.