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Thermometers and Its Types

Kink is used ...

Question

Kink is used in a clinical thermometer to:

A

Decrease the accuracy of measurement.

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B

Ease the flow of mercury.

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C

Restrict the backward flow of mercury.

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D

Increase the temperature of thermometer.

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Solution

The correct option is C Restrict the backward flow of mercury.
The kink is used only in a clinical thermometer to restrict the backward flow of mercury so that readings can be taken easily. It is absent in a lab thermometer.

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Q. The commonly used clinical thermometer is made up of a narrow tube (capillary) of thick glass. At the end of the capillary tube is a thin glass bulb filled with mercury. Mercury is preferred in thermometers because it is present in liquid state over a wide range of temperatures. It is a silvery grey in colour, therefore it is relatively easy to observe. It does not stick to the glass in which it is enclosed. The scale in a clinical thermometer extends over a few degrees on either side of the normal body temperature of 37 degree Celsius. It can measure temperature from 35 degree Celsius to 42 degree Celsius. The clinical thermometer is marked to indicate a small change of 0.2 degree Celsius. The capillary tube of a clinical thermometer has a kink or bend that does not allow the mercury to flow back into the bulb before the temperature has been read. To lower the level of mercury, the thermometer has to be given a firm jerk.

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