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# Give reasons:- We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert. - CBSE Class 9 - Science

ConceptStates of Matter The Gaseous State

#### Question

Give reasons:- We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert.

#### Solution 1

Particles of air have large spaces between them. On the other hand, wood has little space between its particles. Also, it is rigid. For this reason, we can easily move our hands in air, but to do the same through a solid block of wood, we need a karate expert.

#### Solution 2

We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. It is because the molecules of air has less force of attraction between them and a very small external force can separate them and pass through it. But in case of solids, the molecules have maximum force of attraction, the particles are tightly bound due to this force. Hence large amount of external force is required to pass through solid.

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#### APPEARS IN

NCERT Solution for Science Textbook for Class 9 (2018 to Current)
Chapter 1: Matter in Our Surroundings
Q: 3.3 | Page no. 6
Solution Give reasons:- We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert. Concept: States of Matter - The Gaseous State.
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