Hold a used hack saw blade with a pair of tongs. Keep the tip of the free end of the blade on the gas stove. Wait for a few minutes. Does the colour of the tip of the blade change? Remove the blade from the flame. Observe the tip once again after some time. Does it get back its original colour?
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Explanation:
Hold a hacksaw blade in a long and keep it on the gas stove. It turns red. Now cool the tip of the blade, you will get its original color.
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Hold a used hack saw blade with a pair of tongs.
Keep the tip of the free end of the blade on the gas stove.
Wait for a few minutes.
Does the colour of the tip of the blade change?
Remove the blade from the flame.
Observe the tip once again after some time.
Does it get back its original colour?
Hold a hacksaw blade in a long and keep it on the gas stove.
It turns red.
Now cool the tip of the blade,
you will get its original color.
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