Question

we can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.
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Answer 1

Answer:

because the force of attraction of air is negligible. but in a block of wood the force of attraction is high.

Explanation:

Answer 2

Air is a gas, it has more space in between particles. But solid block of wood is rigid, hence it is difficult to move our hands through it.