Bi-metal Thermometer

 

A bi-metal thermometer is made of a bi-metallic coil. No liquid is used in such Type of Thermometer.

 

Construction:

 

It consists of a bi-metallic strip in the form of along spiral. One end of the spiral is kept fixed, while a light pointer is attached to the other end.

 

Working:

 

When the temperature rises, the bi-metal strip coil itself into on even tighter spiral due to different expansion rates of the two metals. The pointer moves across the temperature scale and in this way reading is noted.

 

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