Page 102 - ICSE Science 3 : E-book

• When water vapour is cooled or its temperature
Did You Know!
is decreased, it changes into water. This change
Degree Centigrade or
is called condensation. This process is opposite degree Celsius (°C) is one
of evaporation. of the units to measure
temperature. Water boils
• When the temperature of water is decreased by at 100°C and freezes at

cooling, it changes into ice. This change is called 0°C.
freezing or solidifi cation. This process is opposite

of melting.
Water

Cooling Freezing
(Condensation)

Water vapour Ice

Heating/Boiling Melting
(Evaporation)
Water

Change of state of water

ACTIVITY TIME

Increase in Temperature Causes Evaporation

Aim:
To study and understand that water evaporates when temperature is increased

You Need:

Glasses or plastic cups, water, aluminium
foil, a marker

What to Do:
• Fill two glasses or cups with equal

amount of water. Mark the original level
of water in each cup using the marker.
Cover one of the cups with the aluminium
foil while leaving the other uncovered.
• Now take the two cups outside and
place them in a sunny area.

88