Latent heat, or hidden heat, is transported by in the atmosphere.

The given blank can be filled with water vapors.

Explanation:

Latent heat is a kind of energy captivated or discharged into the atmosphere. Latent heat is associated with the modifications in phase between solids, liquids, and gases. The latent heat discharged at the time of any type of storm enhances unsteadiness in the atmosphere possibly resulting in extreme weather.  

Water vapor present in the atmosphere plays an essential role in the formation of clouds. In case if the air is unsaturated or dry, the formation of clouds is not likely to take place as there is least water vapor present in the air. However, if the air is saturated or moist, the water vapor will condense to produce clouds.  

When these molecules of gas condense to produce drops of liquid, the discharging of latent heat takes place into the atmosphere that warms the molecule's surrounding air. This adds unsteadiness in the atmosphere and this surrounding warm air desires to elevate.  

d. making up measurements to record.

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