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.​

Answer 1

We can easily move our hand in air because particles in gaseous state are very far from each other and so there is large intermolecular space whereas to do the same through a solid block of wood we need a karate expert because particles in solid state are very close to each other and in solid, intermolecular space is comparatively less then the gas ( air).

Answer 2

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• 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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It's possible to move our hand in air because the molecules of the air are loosely packed all the molecules are in motion. Gasses are having no shape, no volume it's freely flowing. The intermolecular spaces between molecule of gasses are large. All gas particles are in motion so if we slash our hand in air it's very easy to move.

But if do same for the solid we have to provide max force in min time. Because the intermolecular attraction of gasses are closely packed. Their is no motion of particles between the solids until we exert high amount of force. A professional karate expert knows to exert max force in min time that's why they can break the solid block of wood easily.

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