Question

how do upper fixed point calibrate in a thermometer?​

Answer 1

Answer:

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.

Explanation:

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Answer 2

A mercury thermometer is constructed by with the help of a capillary tube of clean glass.

Explanation:

• A mercury thermometer is constructed by with the help of a capillary tube of clean glass.
• Alternate heating and cooling methods are used to fill the dried mercury into the capillary tube.
• The buls is kept in a bath of higher temeprature than the temperature to be measured.
• Air is exhausted from the open end of the tube and then it is sealed.
• The tube is kept for several days for cooling and then graduated points are made on the thermoetere after choosing the two fizxed points.