ANS:C - linear

The humid volume, also known as the specific volume of moist air, is the volume occupied by a unit mass of moist air at a given temperature and humidity. It is typically expressed in units such as cubic meters per kilogram (m³/kg). The relationship between humid volume and humidity (specifically relative humidity) is approximately inverse. As the humidity (specifically relative humidity) increases, the amount of moisture in the air increases, leading to a decrease in the volume occupied by a unit mass of air. Conversely, as the humidity decreases, the volume occupied by a unit mass of air increases. This relationship is not precisely linear, exponential, or logarithmic, but it tends to behave inversely, with changes in humidity leading to corresponding changes in the volume occupied by the air.