Answer:
a involves changes in temperature
Step-by-step explanation:
Gay-Lussac's Law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant.
Charles's Law states that the volume of a given mass of gas varies directly with the absolute temperature of the gas, when the pressure is kept constant.
The diagram shows what Gay-Lussac’s law and Charles’s law have in common. And both laws involve changes in temperature.