Thermometers

A thermometer is a device used to measure temperature. It works by detecting changes in temperature and displaying the results in either a digital or analog format. There are many types of thermometers available, each with their own unique features and uses. Some of the most common types of thermometers include:

• Mercury-in-glass thermometer: This type of thermometer is made up of a glass tube filled with mercury. As the temperature increases, the mercury expands and rises up the tube, indicating the temperature.  Mercury thermometers are rarely used anymore due to the toxicity of the mercury.  Liquid in glass thermometers are now almost exclusively spirit filled, replacing the mercury.
  

• Digital thermometer: Digital thermometers use electronic sensors to measure temperature and display the results on a digital screen. They are widely used in medical settings and are often more accurate than other types of thermometers.

• Infrared thermometer: An infrared thermometer measures temperature by detecting the heat emitted by an object. It is a non-contact thermometer that is commonly used to measure the temperature of food, machinery, and other objects.

• Bimetallic thermometer: This type of thermometer uses two different metals with different coefficients of thermal expansion, which causes the strip to bend as the temperature changes. The bending of the strip is used to indicate the temperature.

• Thermocouple thermometer: A thermocouple thermometer uses two different metals to generate a voltage that is proportional to the temperature difference between the two metals. This voltage is then used to calculate the temperature.

• Liquid crystal thermometer: A liquid crystal thermometer is a small strip with heat-sensitive liquid crystals that change color as the temperature changes.

Thermometers are used in a wide range of applications, from monitoring the temperature of food and beverages to measuring the temperature of industrial machinery and even monitoring body temperature in medical settings. The choice of thermometer will depend on the specific application and the level of accuracy required.