Page 51 - Science Class 6 Times Publication

(Cooking pots having black and rough surfaces are preferred.

(Water pipes in solar panels are blackened.
(Black and dark colored clothes are preferred in winter season.

Uses of heat

Heat can be used for following activities:
a. For cooking food

We use heat for cooking food. We cook food with the
heat produced by burning fuels like wood, coal, bio-gas,
cooking gas, kerosene, etc. We also cook food by using heat
produced from electricity.

b. For keeping our body warm
We need heat to keep our body warm. Heat is produced inside
our body by the reaction of food with oxygen. We get warmth

from the sun, heater, rewood, etc in the winter season.
c. For running vehicles

Vehicles like car, buses, trucks, aeroplanes, motorcycles, etc
run due to heat. Heat is produced by burning fuels like petrol,
diesel, coal, L.P. gas, etc.

d. For running factories
Heat is required for running machines in factories. Heat is
provided to the machines by the electricity and by burning
fuels like petrol, diesel, etc.
e. For drying clothes and food grains

Heat is used to dry our clothes and food grains. We keep clothes
in the sun after washing. We spread food grains in the sun to
dry them.

Temperature
When you touch cold water, you feel cold. When you touch warm
water, you feel warm. But we cannot say how much warm water is
hotter than the cold water. To say this in numerical value, we need
a quantity. This quantity is temperature. Temperature shows the
degree of hotness or coldness of a substance in numerical value.

Times' Crucial Science and Environment 47 Book 6