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Question

While measuring the temperature of boiling water, sushweta found the temperature to be 85 degrees centigrade only. What can be the probable reason for this?

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Solution

Water boils at 100 C or 212 F at one atmosphere of pressure. Liquids boil when the pressure of the atmosphere is equal to the pressure of the liquid. When the pressure of the atmosphere is reduced a liquid boils at a lower temperature. This is what happens when you climb a mountain. When pressure cooker is used steam is trapped in the pot and it increases the pressure above the water. this causes the water to boil at a temperature more than 100 C. when you pull back on the plunger, the pressure in the syringe is reduced and the liquid boils t a lower temperature. You can boil water at about 50 C in this system.

Here the reason is,she measures the temperature at lower pressure condition


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