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← ScienceWhich outcome occurs when a bimetallic strip thermometer exceeds its design temperature when in steam?
A)Permanent change in length occurs✓
B)Materials undergo rapid sublimation
C)Accurate temperature reading is maintained
D)The metals reach thermal equilibrium
💡 Explanation
Permanent deformation results because differential thermal expansion exceeds the material's yield strength creating plastic deformation, rather than remaining elastic maintaining the ability to return to its original shape at design limits. Therefore, a permanent length results, rather than reversible changes.
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