PDF chapter test TRY NOW

Hammer a nail into a tin can. Ease the nail out. Put it in again to make sure that the hole is large enough for the nail. Then, holding the nail with a pair of pliers, scissors or forceps, heat the nail over a candle, in hot water, or over the stove.
  
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Try to put it into the hole in the can.
  
Solution:
 
You will see that, now it is  to put the nail into the hole. Heat  solids. The molecules in the solid ,  and occupy .