Concetti Chiave
- Glass is fragile and prone to breaking due to its poor heat conduction and uneven expansion under temperature changes.
- Protect glassware from impacts with hard objects to prevent chipping or breakage.
- Avoid sudden temperature changes by not pouring hot liquids into cold glass and vice versa; gradually warm containers before use.
- Store glass items with tissue paper or newspaper between them to prevent scratching and breakage.
- Use a soft lining in sinks when washing glassware to reduce the risk of chipping and breakage.
Fragility and heat conduction
Glass is fragile and can break easily. It is a poor conductor of heat. It is therefore easily cracked by changes in temperature. This is because glass does not expand or contract uniformly. This sets up a strain in the glass which causes it to break easily.
Care of table glass ware (for example plates, drinking glasses, oven ware):
1. Protect the wares from striking on hard objects. This can cause chipping or breakage.
2.
How can we avoid temperature shocks?
Prevent wares from sudden changes in temperature. Such temperature changes cause glass wares to crack or break. For instance:
- do not pour very hot water into a cold glass.
- do not pour very cold water into a hot glass for example a flask which has just been emptied of cold water.
3. Warm up cold containers such as glass cups, tea pots, before hot liquids are poured in them. This can be done by first rinsing the glass cup with little hot water.
4. Glass oven wares should not be put suddenly into a very hot oven. It should be allowed to warm up gradually.
5. Avoid scratching the surface of glass wares with abrasive or sharp objects.
6.
Storage and washing precautions
Place a tissue paper or old newspaper between plates, tumblers and bowls when they are stored. This prevents breakage and scratching.
7. Line the sink with soft cloth or rubber mat when washing glasswares. This helps to reduce chipping and breakage of glass ware.
8. Do not place glass tumblers inside one another for storing or carrying. They may become stuck together.
Domande da interrogazione
- Why is glass prone to breaking with temperature changes?
- What are some methods to prevent temperature shocks in glassware?
Glass is fragile and a poor conductor of heat, which means it doesn't expand or contract uniformly. This uneven expansion sets up a strain in the glass, making it susceptible to cracking or breaking when exposed to sudden temperature changes.
To prevent temperature shocks, avoid pouring very hot liquids into cold glass and vice versa. Gradually warm up glass containers before adding hot liquids, and allow glass ovenware to warm up slowly before placing it in a hot oven.
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