thermos flask
Definition
Noun: A thermos flask is a type of vacuum flask designed to preserve the temperature of its contents, keeping hot drinks hot and cold drinks cold for an extended period. It consists of a double-walled container with a vacuum between the walls, which minimizes heat transfer.
Usage
The term "thermos flask" is used to refer to the portable insulated container itself. It is often used for carrying beverages like coffee, tea, or water. - She packed a thermos flask of hot soup for the hike. - Remember to bring a thermos flask filled with ice water for the picnic.
Advanced Usage
- As a generic term: While "Thermos" is a trademarked brand name, "thermos flask" is commonly used generically to refer to any vacuum flask.
- He grabbed a thermos flask from the cupboard, not caring about the brand.
Variants and Related Words
- Thermos (noun, often used interchangeably): A brand name that has become a generic term for a vacuum flask.
- I'll make some tea for your Thermos.
- Vacuum flask (noun): The more general technical term for the same type of container.
- The scientific principle behind a thermos flask is that of a vacuum flask.
- Insulated bottle/flask (noun): A broader term for any container designed to maintain temperature.
Synonyms
- Vacuum bottle
- Insulated flask
- Travel mug (specifically for drinks, though typically refers to a cup with a lid)
Notes
- The core function is thermal insulation. The vacuum between the inner and outer walls prevents heat transfer by conduction or convection.
- It is important to note that "Thermos" is a proprietary eponym. In formal or technical writing, "vacuum flask" may be preferred.
Noun
-
vacuum flask that preserves temperature of hot or cold drinks
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