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# thermos

noun (a thermos, thermoses — often Thermos)

«thermos» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. A thermos is a special bottle or flask with two walls and a gap between them that keeps hot drinks hot and cold drinks cold for a long time. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/#m1)
2. It is also called a vacuum flask or a flask. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/#m2)

### In the lessons

In everyday life, people take a thermos of hot chocolate or soup on picnics, school trips and walks. In science lessons, it shows insulation: the gap (a vacuum) stops heat moving in or out by conduction and convection, and the shiny inside reduces radiation. Phrases: «a thermos of tea», «thermos flask».

### Examples

- Dad brought a thermos of hot cocoa to the football match. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/#x1)
- My soup stayed hot all morning in the thermos. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/#x2)
- A thermos keeps cold drinks cold too. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/#x3)
- Be careful when you open the thermos — the steam is hot. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/#x4)
- We learnt how a thermos stops heat escaping. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/#x5)
- In the UK, people often just call it a flask. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/#x6)

### Note

Countable noun; plural «thermoses». «Thermos» was a brand name, so some write it with a capital T. «Therm» means heat (as in «thermometer»). Myth: a thermos does not make things hot; it only keeps their temperature.

## On Mova

- [Trees and pragmatics of «thermos» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«thermos» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/thermos.html) on Mova free.