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. why?

Answer 1

As the particles of air are freely movable and they have all the characteristics of gases but the same in solid block of wood the particles are closely packed and is not easy to break..
Karate experts could break it as they apply more force on it..
And this is the reqson y we coupd move our hands freely in air and could not do the same in solid..

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Answer 2

Answer:Air is gas, we have learned that gas particles of less inter-molecular force of attraction and Maximum inter-molecular space. This allows the particles of Gas to move freely. That is the reason why we are able to swing our hands freely in Air. Solid having the maximum force of attraction and the least inter-molecular space. The particles of solid are fixed in one place and won’t move easily. That is the reason why we need a karate expert to break through a wooden block.