This section is from the book "The Corner Cupboard; Or, Facts For Everybody", by Robert Kemp Philp. Also available from Amazon: The Corner Cupboard; or Facts for Everybody.
Glass Breaking (To Prevent By Hot Water). If hot water be poured into a glass with a round bottom, the expansion produced by the heat of the water will cause the bottom of the glass to enlarge; while the sides, which are not heated, retain their former dimensions, and, consequently, if the heat be sufficiently intense, the bottom will be forced from the sides, and a crack or flaw will surround that part of the glass by which the sides are united to the bottom. If, however, the glass be previously washed with a little warm water, so that the whole is gradually heated, and, therefore, gradually expanded, then the hot water may be poured in without danger ; because, although the bottom will expand as before, yet the sides also enlarge, and the whole vessel undergoes a simitar change of heat.
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