Question

Why doesn’t the laboratory thermometer have kink?

Answer 1

This is possible because of the kink. The kink breaks the connection between the mercury in the capillary and the bulb containing it at the lower end of the thermometers. ... The mercury level has to go up and down continuously. So, there is  no kink in a laboratory thermometers.


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Answer 2

Kink also is called a constriction .

⊕ Constrictions present in a thermometer are used for the following

О Constrictions prevent the level of the thermometric liquid to suddenly fall after measuring the temperature.

О The constriction hence conserves the reading of the thermometer for a certain period of time after which it falls .

О This allows the user to get enough time to read the readings of the level of the thermometer.

Θ Kink is not present in lab thermometers.

ОThe absence of constrictions help to measure the temperature readings accurately .

О In a laboratory the thermometer is generally required for measuring different instances of a chemical reaction

О The chemical reaction may change the temperatures very abruptly.

О Thus constrictions should interrupt the accurate and rapid changes in the thermometer.

О This also helps to read temperature in liquids because the temperature should rapidly change in such a case.

→ That's why kink is not present in laboratory thermometer

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