How do upper fixed point calibrate in a thermometer ? Explain it .​

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Explanation:

To mark the upper fixed point, the thermometer is placed in a hypsometer containing water as shown in the figure. The bulb of the thermometer should be outside the water. When the mercury level becomes stationary at a temperature of steam, the level is marked, which represents the upper fixed point of the thermometer.

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because it does not have the potential to be entirely used up

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