Write the short note in clinical thermometer
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The clinical thermometer is used to measure the temperature of the human body.
A clinical thermometer is graduated from 34°C to 42°C. This is because the temperature of the human body lies within this range. You may be aware that normal body temperature of a healthy person is 37°C.
The bore of the clinical thermometer is very fine and there is a kink or a constriction just above the bulb.
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We find that many of the physical properties, (like thermal expansion, pressure, volume) of different materials, change with temperature in a regular and systematic manner. We can, therefore, use these properties as a way of measuring
temperature. The simplest thermometer, with which we all are familiar, is the mercury in glass thermometer. It is based on
the thermal expansion of mercury. This thernmometer is shown in the figure here.It consists of a narrow capillary tube of glass that is closed at its upper end and has a bulb at its lower end. The bulb is
filled with mercury. Inside the capillary tube we can see a small shining thread of mercury. The mercury, present in the
bulb of the thermometer, expands when heated. The extent of its expansion, and, therefore, the length of mercury thread
in the capillary tube, depends on the extent of heating of the thermometer. This, in turn, depends on the temperature
of the object with which the thermometer bulb has been put in contact. The length of the mercury thread (in the
thermometer) can, thus, give us a measure of the temperature of the object....
Explanation:
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