Page 234 - New Medley 4 Semester 2 PDF (Merged)

Liquid

In liquid state, the matter does not have a definite shape

but it occupies a definite amount of space. In this state,
the molecules do not lie very close to each other. They have

more space between them than the molecules of solids. The
molecules of liquid are able to slide past each other. Water, Molecules in liquid state
are loosely packed
milk, soft drinks, fruit juices, etc., are some liquids.
• Hands-on Learning
Activity

Take some water in a glass tumbler. Pour this water into a cup
and then into a beaker. Observe the shape of the water.
Does water have same shape?
What do you conclude?

Gas

In gaseous state, the matter neither has a definite shape

nor does it occupy a definite amount of space. In this state,
molecules lie far apart to each other. Therefore, gases do not

have a definite shape. They take the shape of their containers. Molecules in gaseous state
are very loosely packed

Activity S E L Self-Management • Experiential Learning

Take a balloon and blow it. Squeeze the balloon. What happens to the shape of the balloon? Now,
take balloons of different shapes – round, long or heart-shaped. Blow them and observe what
shape the air takes in each balloon?

The molecules of a gas can easily spread through any space available to them.
That is why we can feel the smell of many things like cooking food, perfume,

incense stick or agarbatti, etc. at a distance.

Air contains many gases. The air in gaseous state is filled in footballs, balloons,
tyres of vehicles, etc.

Change in the state of matter
Many substances can exist in more than one state.

Water is normally a liquid, but at 0°C, the liquid water changes into solid ice.

This process is called freezing. On the reverse, ice changes into water on heating.

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