Bimetallic Strip, 4A30.10

Location:

• Cabinet: Thermodynamics Cabinet

• Bay: (A3)

• Shelf: #1

(attachment photo showing the fully set up demonstration)

Description:

Insert description of apparatus, its component, what it is demonstrating.

Setup:

1. Install the burner.
2. Heat the bimetallic strip until it bends to one side.
3. Then, open the liquid nitrogen tank and put the bimetallic strip in the liquid nitrogen tank.
4. Take the bimetallic strip out of the liquid nitrogen tank and show students that it bends to the opposite side.

Cautions, Warnings, or Safety Concerns:

1. Beware of the burner and the liquid nitrogen.

Demonstration:

The bimetallic strip consists of brass and stainless steel. Since brass has higher thermal [http://en.wikipedia.org/wiki/Coefficient_of_thermal_expansion expansion coefficient] than stainless steel. When it is heated by the burner, it bends to the stainless steel side. On the other hand, placed in liquid nitrogen (77K) the strip bends in opposite which is to the brass side.

References:

1. [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/bimetal.html Hyperphysics]

[:ThermalProperties:Thermal Properties of Matter]

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