37. Thermal Expansion
A. Use a material that expands or contracts with heat.
Example:
• Fit a tight joint together by cooling the inner part to contract, heating the outer part to expand, putting the joint together, and returning to equilibrium.
B. Use various materials with different coefficients of heat expansion.
Example:
• To control the opening of roof windows in a greenhouse, bimetallic plates are connected to the windows. A change in temperature bends the plates, causing the window to open or close.
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