A vacuum flask, commonly known as a thermos, is used to maintain the temperature of its contents, keeping hot liquids hot and cold liquids cold for extended periods. It consists of two flasks, one inside the other, separated by a vacuum. This vacuum significantly reduces heat transfer by conduction or convection. Additionally, the inner surfaces are often reflective to minimize heat transfer by radiation.
Here are some common uses:
- Beverages: Keeping coffee, tea, or other hot drinks warm, or keeping water, juice, or other cold drinks cool.
- Food: Maintaining the temperature of soups, stews, or other meals.
- Laboratory Use: Storing chemicals or samples at a constant temperature.
- Outdoor Activities: Useful for camping, hiking, or picnics where access to heating or cooling is limited.
The vacuum flask is a versatile tool for anyone needing to keep liquids or foods at a desired temperature for several hours.
