Answer:
relative humidity
Step-by-step explanation:
We shall first examine the meanings of all terminologies and then deduct our answer
Moisture : The presence of a liquid substances in the environment in form of vapor
Relative humidity : Is the amount of water vapor in the atmosphere. It determines how dry or cool the air is. High humidity means cool environment (air); Low humidity means dry environment
Dew point : It is the atmospheric temperature below which condensation of water droplets begin and then dew is form
Precipitation: All forms of water particles, whether liquid or solid, that fall from the atmosphere for examples rain, hail, snow or sleet.
From the explanation above, we can deduce that the term that describes the amount of water in volume of air at a specific temperature compared to the amount of water that could be in the air at that temperature is relative humidity