Assertion (A): When a very hot liquid is poured into a thick glass tumbler it cracks.
Reason (R): Unequal expansion of inner and outer glass walls causes the glass to crack.
Answer:
Both A and Rare true but R is the correct explanation of
assertion
Both A and R are true but Ris not correct explanation of
assertion
A is true but Ris false.
A is false but R is true.
Answers
Answer:
When in winter, hot water is poured in the glass tumbler. its inner surface tends to expand while the Outer surface in contact with cold atmosphere does not. This opposite interaction causes the tumbler to break.
Hence, option C is correct.
Answer:
Option A) Both A and R are true and R is correct explanation of A.
Explanation:
Most substances on addition of heat have the tendency to expand. This is called thermal expansion. Glass also expands when its temperature is increased. This expansion is so sudden and unequal.
When hot water is added , the atoms speed up and the glass expands. If the glass container is not brought up to much higher temperature in a uniform manner , the expansion will not be equally distributed over the surface .
This sudden tendency to expand puts strain on glass and stress is developed in the inner walls of glass which causes it to break .
Hence, it is the unequal expansion that causes the glass plate to break .
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