Question

3. (a) What is gas? Give two examples.
(b) Distinguish between solid, liquid and gas
on the basis of free surfaces.
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Answer 1

Answer:

it is a vaporised form of water it expands freely .it has no definite shape and volume.

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Answer 2

Answer:

A gases area form of matter with very loosely packed molecules.

Example - Pressure cooker gas,gas balloon

Q2. Solids-Solids are substances that have a fixed size and fixed shape.The molecules in solids are packed very tightly and held together by a strong force, so they don't move very easily.

Liquid- Liquid are substances that do not have a fixed shape, but they have a fixed volume. They take shape of the container in which they are kept.

Gases- Gases didn't have fixed shape or a volume. The molecules of gases are spread out in an open space free and occupy the entire space available to them.

Explanation:

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