Evening Republican, Volume 20, Number 177, Rensselaer, Jasper County, 25 July 1916 — Effect of Heat on Glasses. [ARTICLE]

Effect of Heat on Glasses.

Thin glasses do not crack so easily as thick glasses when you pour hot 1 ' water Into them. This Is because the heat penetrates the thin glass so quick* ly as to heat all parts of it equally, and they hold together in the expansion which occurs. When hot water is poured into a thick glass the particles forming the inside of the glass begin to expand before the heat has. penetrated to the outside of the glass, and in the effort to expand the inside particles of the glass break away from the particles of the I outer ride, thereby, causing the crack.