Bimetallic Strip with Electric Contact
Simple demonstrator for thermal expansion
A simple device that shows how we can use two different metals joined together to produce a thermostat.
The apparatus consists of a bimetal strip that expands differently on the both sides due to the two different materials.
Once heated, it will bend to one side as one of the metals will expand faster than the other.
Bimetallic Strip with Electric Contact
experiment: Thermal expansion
Many of today's thermostats are based on the differential expansion of two different metals (brass and iron, for example), which was discovered in the 18th century.
Differential expansion causes the metals to change shape when heated. This change in shape can then be used to a throw a switch, for example.
With our Bimetal Strip it is possible to demonstrate this behaviour by just connecting a multimeter to the electric contacts.
Before it is heated you will see that the bi-metal strip will make a complete circuit.
When it starts to be heated the circuit will open as the bi-metal strip will visibly bend way.
Once cooled it will revert back to its original position, making the circuit once more
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