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# hydrogen

«hydrogen» in Mova's school dictionary: **The lightest of all chemical elements; a gas with no…** — its meaning for a pupil, its sense in the lessons and examples, with 5 sentences of Mova's corpora that use it.

### part of speech

noun (hydrogen — uncountable)

### meaning for a pupil

The lightest of all chemical elements; a gas with no colour, smell or taste that burns easily. Its chemical symbol is H. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydrogen/#m1)

### sense in the lessons

In science: hydrogen is number 1 in the periodic table; it is the most common element in the universe; stars like the Sun get energy by turning hydrogen into helium. Water is H2O: two atoms of hydrogen and one of oxygen. Hydrogen is used as a clean fuel for some buses and rockets. Phrases: «hydrogen gas», «hydrogen fuel», «hydrogen and oxygen».

### examples

- Water is made of hydrogen and oxygen. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydrogen/#x1)
- Hydrogen is the lightest gas there is. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydrogen/#x2)
- The Sun is mostly hydrogen. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydrogen/#x3)
- Some buses run on hydrogen fuel. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydrogen/#x4)
- Hydrogen burns with a squeaky pop in a test tube. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydrogen/#x5)
- Hydrogen's symbol is H. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydrogen/#x6)
- Old airships were filled with hydrogen, which is dangerous because it burns. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydrogen/#x7)

### note

Uncountable. Symbol H, atomic number 1. Safety: hydrogen catches fire very easily — party balloons use helium instead, which does not burn. Hydrogen is a gas at room temperature.

### In the corpora

- ["H2O" means two hydrogen atoms joined to one oxygen atom: that is one molecule of water.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/3-molecules-when-atoms-join-up/1/)
- [Salt is made of sodium and chlorine; sugar is made of carbon, hydrogen and oxygen.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/3-molecules-when-atoms-join-up/9/)
- [Burning wax joins its carbon and hydrogen with oxygen and makes carbon dioxide and water vapour.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/11-the-candle-and-burning/10/)
- [Antoine Lavoisier showed by careful weighing that matter is not lost when things burn or react; he also named oxygen and hydrogen.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/35-famous-discoveries-stories/8/)
- [Jupiter is a gas giant made mostly of hydrogen and helium, like the Sun, and has no solid surface to stand on.](https://md.mova.elamur.ai/free/en/corpora/school/space/10-jupiter/6/)

### Trees and pragmatics

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