Question

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

Answer 1

                                                        hii

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the intermolecular space  in air is more than that in a solid block so the molecules of air displaces but that did not happen in woods Thats's why................................. 

Answer 2

WE CAN MOVE EASILY IN AIR AS AIR IS A GASEOUS STATE PARTICLE MOLECULAR SPACE IS MORE AND MOLECULAR SPACE IS LESS IN SOLID WOOD .SO WE CAN MOVE EASILY OUR HAND IN AIR AS MORE MOLECULAR SPACE ALLOW S US TO MOVE EASILY ,SO WE NEED A KARATE EXPERT TO MOVE OUR HAND THROUGH A SOLID WOOD