Q.26
You should avoid placing hot dishes on cold surfaces like marble because of
which of the following reason?
- Thermal Shock and Container Fracture:
- Mechanism of Thermal Shock:
- Marble is a dense metamorphic rock with high thermal inertia and conductivity, keeping its surface cold.
- When a hot glass, porcelain, or ceramic casserole dish is placed directly onto a cold marble countertop, rapid localized heat conduction causes uneven thermal contraction between the bottom and sides of the dish.
- The resulting severe internal thermal tensile stress exceeds the tensile strength of the brittle material, causing the container to crack or shatter.
- Conclusion: Difference of temperature will crack the container (Option 4).
Correct option: (4) Difference of temperature will crack the container
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