Question

Why are the glassware used in the kitchen made up of Pyrex glass?
A. Does not crack on heating
B. Crack on heating
C. Resist heat
D. None of these

Answer 1

Hint: We use the principles involved in the expansion of objects when they are subjected to a change in temperature to answer this question.

Complete Step by Step Answer:
Whenever any object is subjected to a change in temperature, it either expands or contracts. The magnitude of expansion or contraction depends on the initial dimensions of the object, its coefficient of thermal expansion, and the change in temperature. The relation between the magnitude of expansion and the initial dimensions of the object, its coefficient of thermal expansion, and the change in temperature is directly proportional. That is, the higher the initial dimensions, the higher the coefficient of thermal expansion, the higher the temperature change, the higher the magnitude of expansion will be.
As for the given case, the glassware in the kitchen is frequently subjected to heat, so they are frequently subjected to change in temperature, and therefore, the glassware in the kitchen must have a lesser coefficient of thermal expansion in order to reduce the expansion and contraction of glassware so that they do not crack easily. Pyrex glass has a very less coefficient of thermal expansion; therefore, the glassware made from that does not easily crack on heating and hence higher durability.Therefore, the correct option is option A, that is does not crack on heating.

Note:Make sure to study the effects of coefficient of thermal expansion on expansion of objects.