#Experiments 9
In this experiment we are going to learn how to make a magic glass with a very easy method and technique
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You need
- A glass
- A book
- A board with a smooth surface
- Cold and hot water
What to do
- Balance the board on the book so that it is slightly tilted. Rinse the glass in cold water and put upside down on the highest point on the board
- Now take the glass and raise in hot water and put it once more on the highest point of the board.
When the glass is rinsed with cold water, it moves slowly towards the bottom of the board, then stops. But when the glass is rinsed with hot water, it slides with speed and falls
Because
.......the air contained in the glass, heated by the water, expands the glass rises very very slightly from the board, so it can slide towards the bottom without any resistance
Take away
Air expands when heated