We can easily move our hand in the air but to do the same through a solid block of wood, we need a karate expert.
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Solution
We can easily move our hands in the air because, in the case of air the interparticle space is more, which simply means the intermolecular force of attraction is low, hence are particles are far away from each other.
Whereas, in the case of solids we need a karate expert because the interparticle space is very less, which simply means that intermolecular force is very high, hence the particles are very closely intact with each other.