Define hollow tile and hollow bricks?

This a concrete block (rectangular) which is hollow (empty inside). This is a masonry unit and used in civil engineering.

For insulation purposes. It creates a camera or layer of air that acts as a barrier and helps to maintain a building's heat inside. The same way the hair on your skin does when it stands on end in...

is deep space

Your question makes absolutely no sense.If in Hollow you mean the ghost, then it happens to cause an amount of fear in those who hear the tale, or the ones who happen to see the ghost who searches in...

birds have hollow bones to help them fly