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4A30.10 - Bimetallic Strip

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​4A30.10 - Bimetallic Strip

Preview
SelectSelected
Title4A30.10 - Bimetallic Strip
Objective

Show how a simple bimetallic strip reacts to different temperatures.

StatusAvailable
Assembly Instructions

Obtain demonstration equipment materials. Place bimetallic strip on Aluminum plate. Check that the propane torch works.

Setup Time10
Operation Time
Preview Time
Operation Instructions

Turn on gas supply and ignite flame. Pick up the bimetallic strip and move it around in the flame. When the it gets hot, the metal will begin to bend in a direction. This is because of the difference in thermal expansion of brass and steel. Cool down the strip by placing it back on to the aluminum plate.

**Optional** - an alternative setup involving thermal contraction and liquid nitrogen (LN2) can be provided which shows bending in the opposite direction from heating. This option has additional safety requirements of gloves, goggles, cryogenic warning signs.

ExportableYes
Demo on DimeNo
PIRA 200Yes
Export Instructions (if different)
HazardsNone
Analysis/Information

A piece of brass and steel, each with different coefficients of expansion, are stuck together in a single strip. When they are heated in a flame, the different expansion coefficients cause the strip to bend in a curve toward the one that expands less (steel). To get the strip to bend in the opposite direction, use liquid N2.

Category4 Thermodynamics
Subcategory4A - Thermal Properties of Matter
Keywordssolid expansion, bi-metallic
Construction Information
 
  
  
bi-metallic strip
1
propane torch
1
grounding plate W/O ground plug - just aluminum plate
1
liquid nitrogen (optional)
danger sign
1