How do upper fixed point calibrate in a thermometer? Explain it.
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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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The upper fixed point is that at which the fluid used in the thermometer has maximum volume.
Explanation:
- A thermometer is made up of a glass capillary tube.
- The thermometer is pushed into a wall of a vessel known as hygrometer.
- Boiling water is put into the tube and it is made sure that the bull does not dip into the water.
- The mercury is placed into the thermometer and is allowed to cool.
- After cooling the thermometer is graduated into upper and lower pints by marking fixed upper and fixed lower points.
- The upper fixed point is that at which the fluid used in the thermometer has maximum volume.
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