Final answer:
The maximum amount of water vapor that the air can hold increases with higher temperatures due to the rise in vapor pressure, which in turn increases the saturation vapor density.
Step-by-step explanation:
The capacity of air to hold water vapor is indeed dependent on temperature. To complete the sentence, the correct terms would be: the higher the temperature, the more water vapor it can hold. This relationship exists because vapor pressure, which determines the amount of water that can exist in the vapor phase, increases with temperature. When the air has reached a point where its partial pressure equals the vapor pressure of water, it has reached saturation, and the relative humidity is 100%. If the temperature rises, the air can hold more water vapor before becoming saturated, as the saturation vapor density increases.