Water can be made to boil at a temperature above or below $100 ° C$ . Explain.

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Solution

Pure water boils at $100 ° C$ at one atmospheric pressure.
If the pressure is decreased, water will boil at a temperature lower than $100 ° C$ .
For example at higher altitudes, the pressure is less and it becomes difficult to cook food because water boils at a temperature lower than $100 ° C$ .
If the pressure is increased, water will boil at a temperature higher than $100 ° C$ .

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