<Dd> Above the Curie temperature, the magnetic susceptibility of a paramagnetic material exhibits an inverse temperature dependence . This phenomenon is the basis of a magnetic cryometer . </Dd> <P> Thermometers utilize a range of physical effects to measure temperature . Temperature sensors are used in a wide variety of scientific and engineering applications, especially measurement systems . Temperature systems are primarily either electrical or mechanical, occasionally inseparable from the system which they control (as in the case of a mercury - in - glass thermometer). Thermometers are used in roadways in cold weather climates to help determine if icing conditions exist . Indoors, thermistors are used in climate control systems such as air conditioners, freezers, heaters, refrigerators, and water heaters . Galileo thermometers are used to measure indoor air temperature, due to their limited measurement range . </P> <P> Such liquid crystal thermometers (which use thermochromic liquid crystals) are also used in mood rings and used to measure the temperature of water in fish tanks . </P> <P> Fiber Bragg grating temperature sensors are used in nuclear power facilities to monitor reactor core temperatures and avoid the possibility of nuclear meltdowns . </P>

What is the use of thermometer in laboratory