And Another Thank You. Glass is a bad heat conductor and therefore it does not tolerate excessive changes in temperature. It is not the hot water that breaks the glass, but the sudden change in temperature, causing internal stress to be exerted on the material; if these changes occur suddenly, they create internal tension that leads to the breakage of the container. During processing, control your boil. Water is arguably the most important substance on Earth, as it provided the pathway towards life as we know it, and is an essential component of survival for every living thing. Usually, when pour water into a glass, the more thick glass is easier to break. When a material absorbs heat, it expands. 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. Never take a glass casserole directly from the freezer and place it into a pre-heated oven. Because the glass tumbler is cold, when hot water is poured, and the inner wall expands rapidly due to thermal expansion and contraction. When you pour hot water into something made out of glass, only the inside dilates, and the outside doesn't, since its temperature is cooler. Short answer: Tap water contains atmospheric gases, such as nitrogen and oxygen, dissolved in it. I'm not sure of this one. Some substances expand upon thawing, and, while water has the opposite pattern, I could imagine that if these samples were in a confined space, there could be something going on with the other substances other than water, that caused them to expand.But really, I don't know...I haven't ever worked with these sorts of materials. Cold water's higher viscosity also causes it to bubble less when poured. Don’t immerse hot pans in cold water. As they cool during filling, the change in temperaturewhen adding the jars back to the water bath can cause breakage. As the glass expands from the heat then quickly contracts again in the cold temperatures, the change can cause a chip or crack in the windshield. When canning, remember that the jars must be hot before you add more hot liquid. I've also noticed this with ceramics. Now I know the reason y. . I pulled my clothes away from me, but my left foot got burned some. I feel like a fool each time this happens. It helps to thoroughly pre-heat the glass with tap hot water. Fortunately it didn't break into many pieces, just developed a big crack in the bottom and started leaking. This opposite interaction causes the tumbler to break. Once the contents is 90% thawed or greater, pour into another container to heat or warm. Never pour cold liquids into hot glassware. How did the glass and the tea react in terms of chemicals. Avoid using generic glass for hot liquids; stick to ceramics or glass that we know to be heat-resistant. The temperature of the glass is cold enough to cool down the water vapor in the surrounding air, so it turns from gas to liquid. When you pour a very hot liquid into a thick tumbler what happens is, the surface of glass that comes in the contact with the hot liquid heats up and expands as per its coefficient of thermal expansion, while the outer layer is cold and does not expands. 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