Question

Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler. (True or False)

Answer 1

First we have to know that condensation is the process where water vapour becomes liquid. It is the reverse of evaporation, where liquid water becomes a vapour. Condensation happens one of two ways: either the air is cooled to its dew point or it becomes so saturated with water vapour that it cannot hold any more water.

Complete answer:
Water evaporates into air from oceans, rivers, lakes and other water resources. The process of water changing into its vapour is called evaporation. The evaporation of water takes place only in sunlight. As the water vapour cools down and condenses, it attaches to small particles of dust floating in the atmosphere, forming tiny liquid water droplets in the upper layers of air where it is cooler. We all know hot air is present above the cooled air because it is light, so droplets are formed in hot air which lie above the cool air and come back on the earth surface in the form of rain, fog, frost by condensation.
Hence the given statement is true.

Note:
The dew point is the temperature at which air is saturated with water vapour, which is the gaseous state of water. Also note that, dew point is related to the quantity of moisture in the air. Whereas relative humidity is related to how close the air is to saturation.