A device that automatically responds to changes in temperature by activating a heating or cooling system to maintain the temperature at a desired setting.

any synthetic material, such as polyethylene, that can be molded when hot but becomes hard on cooling

(chemistry) becoming permanently hard or solidifying when heated; used especially of synthetic plastics such as Bakelite.

softening when heated and hardening when cooled, and thus able to be moulded

A plastic with this property.

(physics) Temperature defined in terms of the laws of thermodynamics rather than the properties of a real material: expressed in kelvins.

(physics) a thermometer whose operation is based upon Curie's law; typically used to measure temperatures below 1 K

Of or pertaining to thermoacoustics

(physics) the study of phenomena influenced by thermodynamics and acoustics

A weapon whose power is derived from nuclear fusion at high temperature