The Coefficient of Linear Expansion of Ordinary Glass Is Three

Multiple Choice

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 ___________ the change in length of the Pyrex glass rod.

A) 1/9
B) 1/3
C) equal to
D) 3 times
E) 9 times