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Give a reason : We can easily move our ...

Give a reason : We can easily move our hand in air but to do the same in solid block of wood we need a Karate expert.

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The particles of air have weak intermolecular force of attraction. They also have a large intermolecular space between them. As a result. we can easily move our hand .in air. In case of a solid block of wood or brick the particles are closely packed having a strong intermolecular force of attraction and very less intermolecular space. Hence, it is difficult to move our hand through it.
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