Water jugs are a familiar item in many Vietnamese families, especially in rural areas. They are not just simple water containers but also carry deep cultural and emotional values.
What is a thermos?
A thermos, also known as a thermos, is a type of bottle that can keep hot water hot for a long time. It is often used to hold boiling water to make tea, coffee or for daily use.
Structure of thermos
- Tank shell: Usually made of metal (aluminum, stainless steel) or plastic.
- Inner tank: Made of glass, with silver coating or vacuum layer to retain heat.
- Lid: Usually made of plastic, with rubber gasket to keep airtight.
Uses of thermos
- Keep water hot : Keeps the temperature of boiling water for many hours, serving for making tea, coffee, or use when needed.
- Keep water cold : Some thermos bottles can keep water or drinks cold.
- Convenient : Use at home, office, or bring along when traveling or picnicking.
Working principle
Thermos works on the principle of insulation. The vacuum layer or silver coating inside the thermos helps prevent heat transfer by conduction and radiation, while the thermos shell helps prevent heat transfer by convection.
Advantages of thermos
- Keep water hot for a long time.
- Convenient to use, can be carried to work, school or picnics.
- Safe for health because it does not change water quality.
- Affordable price, suitable for many users.
Preserve
- Regular cleaning : Wash the bottle with warm water and soap, avoid using hard brushes.
- Avoid impact : Keep the bottle in a safe place, avoid dropping or strong impact.
- Do not store other liquids : Avoid storing milk, juice, or carbonated drinks as they are difficult to clean and may cause odors.
Notes when using thermos
- Do not store carbonated beverages : Pressure from carbonated beverages may cause the bottle to explode.
- Check the lid regularly : Make sure the lid is not loose or damaged.
- Not for microwave use : The thermos cannot be used in a microwave.
A thermos is a useful item that helps you always have hot or cold water when needed. Choose a quality thermos and use it properly to enjoy maximum convenience!
