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Why does a hot glass chimney often crack when a drop of water falls on it? - Physics

Short Note
Why does a hot glass chimney often crack when a drop of waterfalls on it?
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Solution

A hot glass chimney often crack when a drop of water falls on it because the glass of the chimney expands due to constant heating by the flame of the chimney but as a cooler water drop falls on the glass, the outer surface contracts more than the inner side of the glass. This unequal contraction between the two surfaces causes a strain and the glass cracks.
Concept: Reactivity of Metals with Cold Water, Hot Water and Steam (With Products Formed).
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APPEARS IN

Frank Class 9 Physics ICSE
Chapter 5 Heat
Thermal Expansion | Q 18 | Page 203
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