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 Why do glassware crack when it is hot and cold?

Inject hot water into glassware,Does the temperature of the glass increase at the same time?Will the glass be stressed by the expansion?Glass is a poor conductor,And there is fragility.When the temperature inside and outside the glassware is too different,The expansion inside and outside is inconsistent.For example, inject cold water into a cold glass bottle,Then the circumference in the bottle will increase.However, the temperature of the glass outside the bottle has not risen to the same level as the bottle.Therefore, the outer circumference has not been able to increase.Then it was squeezed by the glass in the bottle.

The glassware that can withstand hot and cold,To select a glass with a small expansion rate,The thickness of the vessel should be small.And the shape of the vessel must not be too sharply curved.therefore,The round flask is used for the heating flask for chemical experiments.

Beverage factory or winery or food factory when the product is canned,generally high temperature cans,the general temperature difference of canned glass is about 42 degrees.for example, food should be packed at 110 degrees.then the glass jar should be preheated to 68 degrees.this is a safe temperature coefficient.