Final answer:
As temperature increases, the capacity of air to hold water vapor increases due to the rise in vapor pressure, allowing more water molecules to enter the gas phase.
Step-by-step explanation:
The question relates to the effect of temperature on the amount of water vapor that air can hold. As the temperature increases, the vapor pressure of water also increases because the molecular speeds are higher. This process allows more water molecules to enter the gas phase. Therefore, the capacity of the air to contain water vapor increases with temperature. To put it simply, when the temperature goes up, the amount of water vapor that the air can hold also goes up.