Thermometer

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A thermometer is a device used to measure temperature. It typically consists of a temperature sensor, which changes in response to temperature variations, and a method to convert this change into a numerical value. There are several types of thermometers, each based on different principles and suitable for different applications:

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Thermometer

Mercury-in-glass thermometer: This type uses mercury encased in a glass tube. As the temperature rises, the mercury expands and moves up the tube. These thermometers are often used in clinical settings and for outdoor temperature measurement.
Alcohol thermometer: Similar to mercury thermometers but uses alcohol instead. Alcohol expands more uniformly than mercury and is safer since it is less toxic. These are often used in meteorology.
Digital thermometer: Uses electronic sensors to measure temperature and displays the reading on a digital screen. These are common for medical use, home use, and various industrial applications.
Infrared thermometer: Measures temperature from a distance by detecting infrared radiation emitted by an object. Often used in situations where it is not practical or safe to come into contact with the object being measured.
Bimetallic strip thermometer: Consists of two different metals bonded together that expand at different rates as they are heated. This differential expansion causes the strip to bend, and this bending is used to measure temperature. Common in household and industrial applications like ovens and thermostats.
Thermocouple: Made of two different types of metal wires joined at one end. When the junction is heated or cooled, it produces a voltage that can be interpreted to measure temperature. Used extensively in industrial settings.
Thermistor: A type of resistor whose resistance varies significantly with temperature. They are used in digital thermometers and various electronic devices to monitor temperature.