Thermometers

thumb|Mercury thermometer (mercury-in-glass thermometer) for measurement of room temperature.

A thermistor is a semiconductor type of resistor in which the resistance is strongly dependent on temperature. The word thermistor is a portmanteau of thermal and resistor. The varying resistance with temperature allows these devices to be used as temperature sensors, or to control current as a function of temperature. Some thermistors have decreasing resistance with temperature, while other types have increasing resistance with temperature. This allows them to be used for limiting current to cold circuits, e.g. for inrush current protection, or for limiting current to hot circuits, e.g. to pr

thumb|right|Thermocouple connected to a multimeter displaying room temperature in °C

thumb|upright|An optical pyrometer thumb|upright|A sailor checking the temperature of a ventilation system

type of temperature sensor (thermometer)

thermometer containing several glass vessels of varying density

device that measures body temperature

thermometer

tool for measuring temperature

strip used to convert a temperature change into mechanical displacement

typical temperature range found in humans

thermometer that measures temperature by the variation in volume or pressure of a gas

Meteorological instrument to measure Temperature

alternative to the mercury thermometer

thumb|upright=0.65|Galileo Galilei|Galileo thermoscope, The [[Musée des Arts et Métiers, Paris]] A thermoscope is a device that shows changes in temperature. A typical design is a tube in which a liquid rises and falls as the temperature changes. The modern thermometer gradually evolved from it with the addition of a scale in the early 17th century and standardisation throughout the 17th and 18th centuries.

measuring device for thermal energy

device for measuring small temperature changes

electric light tower displaying temperature in Baker, California, United States

strip of plastic which changes colour to indicate temperature

thermometer used to measure the internal temperature of meat and other foods

Type of temperature measuring device

A cryometer is a thermometer used to measure very low temperatures of objects. Ethanol-filled thermometers are used in preference to mercury for meteorological measurements and can measure temperatures in the range of . Their main physical limitation is the freezing and boiling point of the liquid used.

Thermometer that records temperature