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Temperature sensors are electronic devices that measure temperatures of objects or environments. They are commonly used in industry, medical, consumer applications, and research and development, among many other areas. The most popular type of temperature sensors is the thermostat, a device that regulates the temperature of a given space, whether it be a building, a room, or even the outside environment. Thermostats come in both mechanical and digital formats and operate in various ways.Mechanical thermostats use a variety of components to sense the temperature of a given environment. These include bimetallic strips that consist of two layers of different metals which expand at different rates when heated. As the temperature rises, the two layers of metal expand at different rates, causing the two to bend in the opposite directions. This bending is connected to a switch mechanism that is triggered when a certain temperature has been reached. This switch then triggers an action, such as activating the air conditioning system, for example, or illuminating a warning light.Digital thermostats use thermistor sensors to measure temperature. A thermistor is a semiconductor device made from a semiconductor material such as copper or boron. The thermistor reacts to changes in temperature by changing its electrical resistance. The thermistor is usually connected to a microcontroller or circuit board with a voltage applied across it. The microcontroller or circuit board monitors the thermistor\'s resistance and converts this information into a temperature reading. This temperature reading is then used to control the appliance associated with the thermostat.Digital thermostats usually come with a display that shows the temperature reading. There are also digital thermostats that can be programmed to control the temperature of a given space in a preset way, allowing users to pre-set the temperature to a certain point or have the thermostat regulate the temperature over a set period of time.In addition to thermostats, temperature sensors can also be found in many other areas. For example, they are used in cars to measure engine temperature, to detect changes in room temperature in residential or commercial buildings, and to measure temperature in food products such as meat or poultry. Temperature sensors are also used in the medical field to help diagnose and treat illnesses, as well as in the aerospace industry for various applications such as measuring fuel temperature in aircraft engines.In conclusion, temperature sensors are a valuable tool in many industries and applications. They can be found in a variety of formats, whether mechanical or digital, and their working principles are based on a variety of components and technologies. Temperature sensors help keep areas comfortable and safe, while also being used in the medical, aerospace and food industries, to name but a few.

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