Page 60 - Science class 4

The molecules of a gas can easily spread through all the space in a container.

CHANGES FROM ONE STATE OF
MATTER TO ANOTHER

Matter can exist in more than one form.

Water exist in all three forms, i.e. :
solid, liquid and gas. When there is a

change in temperature, one state of
water can be changed into another

state. When temperature is as low as
0°C, the liquid water takes the shape of
ice which is the solid state of water.
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This process is called freezing . When Scientific Updation
ice is heated, it changes into water. Molecules are made up of
This process is called melting . When smaller particles called
water is boiled at high temperature, it atoms.
changes into water vapours. This

process is called evaporation . If steam Cotton
is cooled, it changes in water. This Inverted funnel

process is called condensation .
Sublimate
Sublimation Perforated
asbestos sheet
When iodine is heated, the purple coloured
Mixture
fumes of iodine are observed. This means
that iodine which is a solid directly turns into

the gaseous form on heating. This process is
called sublimation. Sublimation

Solution

When sugar is stirred in water, it
dissolves. Here, sugar is said to be soluble
in water. When a solid dissolves in a liquid,
it forms a solution. Sugar, in this case is a
solute and water is a solvent.

Solids Dissolve in Liquids
Sugar is a solid and water is a liquid.

When a solid (sugar) dissolves in a liquid
(water) to form a solution, such a
solution is called a solid in liquid solution .

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