Physics for IGCSE & O level - Thermal Effects (Section 3 - No. 12)
In a bimetallic strip, why does the strip bend when heated?
The two metals have different densities.
The two metals have different expansion rates.
The two metals react with each other.
The two metals are the same material.
คำอธิบาย
The strip bends because the metals expand at different rates.