Page 103 - EVS Class 04

Condensation

When water vapours cool down, they change back into
drops of water. This process is called condensation. Have
you ever observed drops of water on the surface of a

glass filled with cold drink? These drops are actually
condensed water vapour. The process of evaporation and
condensation are two very important factors which
maintain the balance of water on the earth. They regulate
the water cycle or rain cycle . They cause the continuous

movement of water from water bodies to air and then
back to water bodies.

Water is a very precious natural resource. We
must use water judiciously and prevent its
wastage. Condensation

Evaporation Precipitation
Evaporation
There is a large amount of water found in the
air in the form of water vapour. When water
gets heated, it changes into steam or water Collection
Percolation
vapour and goes into the air. This change of
water into water vapour on heating is called
evaporation.
Water Cycle

Plants give off water vapour through tiny pores present on the surface of the leaves.

This is called transpiration.

There are many conditions in which the water evaporates faster. For
example:

g Water evaporates faster when it is left in the open.

g Water evaporates faster when the air is

dry.
You must have seen that clothes take a long

time to dry in the monsoon season because
the air is full of moisture. In summer season,

Clothes Drying on Clothes line

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