Never pour hot water into a cold glass. Always let your glass or ceramic ware come to room temperature before you use it. If you place a cold item in boiling water, the sudden change in temperature can cause it to crack or explode.
Boiling water can crack or even explode glass containers when poured into them while they're hot.
You probably know that pouring boiling water into a glass can crack or even explode the container. But why does this happen? The answer lies in the different materials and their respective temperature ranges:
- Glass has a narrow range between its softening point (when it becomes malleable) and its melting point (when it becomes liquid).
- Ceramics also have a rather small temperature range, but they're less likely to crack than glass when exposed to extreme temperatures because ceramics are usually made from clays that shrink as they're heated. They therefore contract more than glass does when heated, which means there's less stress on them.
It's best to gradually pour hot liquid into hot glass to prevent cracking.
- Pour the liquid into the glass slowly. When you're pouring hot liquid, it's best to pour it in gradually. This will prevent cracking of your glass and keep your drink from getting too cold.
- Pour at an angle. With careful pouring, you can avoid getting water droplets on your hands or arm as well as protect yourself from burns if any of that steam touches you while pouring into a mug/glass/mug again (though still make sure that this doesn't happen).
- From height above the glass/mug/container; alternatively, use a different container altogether if possible! I'd recommend measuring out exactly how much boiling water should go into each mug (or other container) before starting; then simply fill up each one separately until filled!
You should never pour cold water into a hot glass, as the drastic temperature change may damage it.
The glass is a poor thermal conductor, which means it doesn't conduct heat very well. As soon as you add the boiling water to it, the glass will cool down the water too quickly. This may cause cracking and shattering or breaking of your glassware.
The best way to avoid this is by pouring cold water into a hot glass slowly and gently.
Avoid putting temperature extremes on glass and ceramics.
- This includes avoiding putting hot things in cold places, and vice versa. For example, don't put a hot cup of coffee on a cold table. Similarly, don't put your ice-cold beer into the microwave to heat it up (although this is an excellent idea if you know what you're doing).
- If you want to get fancy with it: You can also add some water to your hot dish before placing it inside the fridge if that helps prevent any cracking due to sudden temperature changes during transfer from one place (your countertop) over another (your fridge).
When it comes to pouring hot water into glasses, you really have to be careful. Although there are many things that can be done to prevent glass from cracking or shattering when you pour boiling water in them, it’s always best if you can avoid doing so altogether. This is especially true when dealing with fragile items like cups and bowls that could break easily! If at all possible, try warming up your glassware by pouring hot water into it slowly rather than immediately dumping boiling water over its surface—this will help prevent damage while also helping keep your hands safe as well.