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What is Thermometer?
Thermometer an instrument for measuring and indicating temperature (how hot or cold something is).
There are two types of thermometer which we use very commonly, they are:
1. Oral and rectal thermometers
It is a narrow, concealed glass tube containing mercury. When the temperature rises or falls, the mercury expands or contracts, causing it to move up or down the scale.
2. Digital thermometers
It uses electronics to measure temperature.
It contains a small computing mechanism and a resistor. A change in temperature causes the sensor to notice a change in resistance. The computer converts the difference in resistance into a difference in temperature and offers a digital readout in degrees. The thermoresistor sensor is called a thermistor.
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