Temperature at which a substance changes state

Details Temperature at which a substance changes state Temperature at which a substance changes state

G - Physics

01

N

G01N 25/04 (2006.01)

Patent

CA 2059656

Infra-red light from an emitter (16) is directed through a glass slide (10) to an area (12) on which a solid substance is locat- ed. Light reflected from the undersurface of the solid substance is received by a receiver (18). The substance is heated by a strip heater (14). When the substance changes state the amount of reflected light arriving at the receiver (18) varies, and information coming from an electronic thermometer (20) or (20A) records the temperature at which the change of state has occurred.

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