The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass.An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water.The change in length of the ordinary glass rod will be 3 times the change in length of the Pyrex glass rod.

Question

Quizplus · Accepted Answer

The coefficient of linear expansion is the factor by which a material expands when heated. The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. This means that for the same change in temperature, ordinary glass will expand three times as much as Pyrex glass. When the two rods are dropped into boiling water, they will both undergo thermal expansion. However, the extension of the ordinary glass rod will be three times that of the Pyrex glass rod because of its higher coefficient of linear expansion. Therefore, the statement is true.

The Coefficient of Linear Expansion of Ordinary Glass Is Three