Let's study the effect of heating on metal.
Materials:
Candle
Matches
Fire tongs
or tweezers
A lock
with a tight fitting key
Put the key into the lock. The keep fits in properly.
Now put the key over the burning candle. Hold the key with the help of fire tongs or tweezers.
Put the key for 5 minutes.
Now try to fit the key back into the lock. What happens? Does the key fits?
Materials:
Candle
Matches
Fire tongs
or tweezersA lock
with a tight fitting keyInstructions
Put the key into the lock. The keep fits in properly.
Now put the key over the burning candle. Hold the key with the help of fire tongs or tweezers.
Put the key for 5 minutes.
Now try to fit the key back into the lock. What happens? Does the key fits?
What is happening??
Burning metal causes expansion of the metal. So the key expands and cannot fit into the key hole!
To fit the key back in follow the steps below:-
Leave the key indoor to cool it to room temperature.
After cooling try to fit the key into the key hole again. Does the key fits?
On cooling, the metal contract and returns to it's normal size, thus, it fits!!!
To fit the key back in follow the steps below:-
Leave the key indoor to cool it to room temperature.
After cooling try to fit the key into the key hole again. Does the key fits?
On cooling, the metal contract and returns to it's normal size, thus, it fits!!!
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