The answer option which best describes the relationship between air temperature and relative humidity is: C. Cold air can hold less water vapor than warm air.
Temperature can be defined as a measure of the degree of coldness or hotness of a body or physical object.
In Science, an object's temperature is measured by using a thermometer and its standard units are;
At constant humidity, a decrease in the atmospheric (air) temperature result in an increase in the relative humidity in an atmosphere.
Consequently, cold air is able to hold less water vapor in comparison with warm air.
In conclusion, the relationship between air temperature and relative humidity is that warm air can hold more water vapor than cold air while cold air can hold lesser water vapor due to relative humidity.
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