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# thermos

«thermos» in Mova's school dictionary: **a special bottle or flask with two walls and a gap…** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

noun (a thermos, thermoses — often Thermos)

### meaning for a pupil

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://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/#m1)

2) It is also called a vacuum flask or a flask. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/#m2)

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

### Trees and pragmatics

[Every meaning and example of «thermos» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/thermos/), each sentence with its dependency tree and frames.