---
title: hydrogen — school dictionary · trees and pragmatics
description: «hydrogen» in the school dictionary: The lightest of all chemical elements; a gas with no colour, smell or taste that burns easily. Its chemical symbol is H. Every meaning for a pupil with its dependency tree and pragmatics.
---

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# hydrogen

<!-- .vintro -->
**Who acts:** smell, chemical symbol, Hydrogen, lightest gas, Sun, buses · **What happens:** burn, be, make, run, fill · **To what, where:** H., Water, lightest gas, hydrogen, hydrogen fuel, test tube

<!-- .vabout -->
«hydrogen» in the school dictionary: its meaning for a pupil and its 7 examples, every sentence parsed by Mova itself — its syntax tree, a dependency tree in the style of Universal Dependencies, and its pragmatics clause by clause. The word in the dictionary, with its sense in the lessons: [hydrogen in the school dictionary](https://md.mova.elamur.ai/free/en/dictionaries/school/w/hydrogen.md).

## Meaning 1 {#m1}

<!-- .ven lang=en -->
The lightest of all chemical elements; a gas with no colour, smell or taste that burns easily. Its chemical symbol is H.

<!-- .note -->
*Sentence 1:* The lightest of all chemical elements; a gas with no colour, smell or taste that burns easily.

<!-- fold The tree, 17 words -->
```conllu
# sent_id = dict:school:hydrogen:m1:1
# text = The lightest of all chemical elements; a gas with no colour, smell or taste that burns easily.
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	lightest	light	ADJ	JJS	Degree=Sup	0	root	_	_
3	of	of	ADP	IN	_	6	case	_	_
4	all	all	DET	DT	PronType=Tot	6	det	_	_
5	chemical	chemical	ADJ	JJ	Degree=Pos	6	amod	_	_
6	elements	element	NOUN	NNS	Number=Plur	2	obl	_	SpaceAfter=No
7	;	;	PUNCT	:	_	9	punct	_	_
8	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	_	_
9	gas	gas	NOUN	NN	Number=Sing	6	appos	_	_
10	with	with	ADP	IN	_	12	case	_	_
11	no	no	DET	DT	PronType=Neg	12	det	_	_
12	colour	colour	NOUN	NN	Number=Sing	9	nmod	_	SpaceAfter=No
13	,	,	PUNCT	,	_	14	punct	_	_
14	smell	smell	NOUN	NN	Number=Sing	9	conj	_	_
15	or	or	CCONJ	CC	_	16	cc	_	_
16	taste	taste	NOUN	NN	Number=Sing	14	conj	_	_
17	that	that	PRON	WDT	PronType=Rel	18	nsubj	_	_
18	burns	burn	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	14	acl:relcl	_	_
19	easily	easily	ADV	RB	_	18	advmod	_	SpaceAfter=No
20	.	.	PUNCT	.	_	2	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **burn** | present | smell or taste |  |  |  |  | easily *property* | vn light\_emission-43.1 «NP V»: agent=Theme |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

<!-- .note -->
*Sentence 2:* Its chemical symbol is H.

```conllu
# sent_id = dict:school:hydrogen:m1:2
# text = Its chemical symbol is H.
1	Its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	3	nmod:poss	_	_
2	chemical	chemical	ADJ	JJ	Degree=Pos	3	amod	_	_
3	symbol	symbol	NOUN	NN	Number=Sing	5	nsubj	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
5	H.	H.	PROPN	NNP	Number=Sing	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | taste's chemical symbol | H. |  |  |  |  | tree rules |

## Example 1 {#x1}

<!-- .ven lang=en -->
Water is made of hydrogen and oxygen.

```conllu
# sent_id = dict:school:hydrogen:x1:1
# text = Water is made of hydrogen and oxygen.
1	Water	water	NOUN	NN	Number=Sing	3	nsubj:pass	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	made	make	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	of	of	ADP	IN	_	5	case	_	_
5	hydrogen	hydrogen	NOUN	NN	Number=Sing	3	obl	_	_
6	and	and	CCONJ	CC	_	7	cc	_	_
7	oxygen	oxygen	NOUN	NN	Number=Sing	5	conj	_	SpaceAfter=No
8	.	.	PUNCT	.	_	3	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present · passive |  | Water |  |  |  | of hydrogen and oxygen | vn build-26.1-1 «NP.asset V NP»: subject=Product |

## Example 2 {#x2}

<!-- .ven lang=en -->
Hydrogen is the lightest gas there is.

```conllu
# sent_id = dict:school:hydrogen:x2:1
# text = Hydrogen is the lightest gas there is.
1	Hydrogen	hydrogen	NOUN	NN	Number=Sing	5	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	lightest	light	ADJ	JJS	Degree=Sup	5	amod	_	_
5	gas	gas	NOUN	NN	Number=Sing	0	root	_	_
6	there	there	PRON	EX	PronType=Dem	7	expl	_	_
7	is	be	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	acl:relcl	_	SpaceAfter=No
8	.	.	PUNCT	.	_	5	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | Hydrogen | the lightest gas |  |  |  |  | tree rules |
| 2 | **be** | present | the lightest gas *not said here* |  |  | there |  |  | vn exist-47.1 «NP V»: agent=Theme |

## Example 3 {#x3}

<!-- .ven lang=en -->
The Sun is mostly hydrogen.

```conllu
# sent_id = dict:school:hydrogen:x3:1
# text = The Sun is mostly hydrogen.
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	Sun	Sun	PROPN	NNP	Number=Sing	5	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
4	mostly	mostly	ADV	RB	_	5	advmod	_	_
5	hydrogen	hydrogen	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
6	.	.	PUNCT	.	_	5	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | the Sun | hydrogen |  |  |  | mostly *property* | tree rules |

## Example 4 {#x4}

<!-- .ven lang=en -->
Some buses run on hydrogen fuel.

```conllu
# sent_id = dict:school:hydrogen:x4:1
# text = Some buses run on hydrogen fuel.
1	Some	some	DET	DT	PronType=Ind	2	det	_	_
2	buses	bus	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	run	run	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	on	on	ADP	IN	_	6	case	_	_
5	hydrogen	hydrogen	NOUN	NN	Number=Sing	6	compound	_	_
6	fuel	fuel	NOUN	NN	Number=Sing	3	obl	_	SpaceAfter=No
7	.	.	PUNCT	.	_	3	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **run** | present | some buses |  |  | hydrogen fuel |  |  | vn run-51.3.2-2-1 «NP V PP.location»: agent=Theme on fuel=Trajectory |

## Example 5 {#x5}

<!-- .ven lang=en -->
Hydrogen burns with a squeaky pop in a test tube.

```conllu
# sent_id = dict:school:hydrogen:x5:1
# text = Hydrogen burns with a squeaky pop in a test tube.
1	Hydrogen	hydrogen	NOUN	NN	Number=Sing	2	nsubj	_	_
2	burns	burn	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	with	with	ADP	IN	_	6	case	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
5	squeaky	squeaky	ADJ	JJ	Degree=Pos	6	amod	_	_
6	pop	pop	NOUN	NN	Number=Sing	2	obl	_	_
7	in	in	ADP	IN	_	10	case	_	_
8	a	a	DET	DT	Definite=Ind|PronType=Art	10	det	_	_
9	test	test	NOUN	NN	Number=Sing	10	compound	_	_
10	tube	tube	NOUN	NN	Number=Sing	2	obl	_	SpaceAfter=No
11	.	.	PUNCT	.	_	2	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **burn** | present | Hydrogen |  |  | a test tube |  | with a squeaky pop | vn light\_emission-43.1 «NP V PP.location»: agent=Theme in tube=Location |

## Example 6 {#x6}

<!-- .ven lang=en -->
Hydrogen's symbol is H.

```conllu
# sent_id = dict:school:hydrogen:x6:1
# text = Hydrogen's symbol is H.
1	Hydrogen	Hydrogen	PROPN	NNP	Number=Sing	3	nmod:poss	_	SpaceAfter=No
2	's	's	PART	POS	_	1	case	_	_
3	symbol	symbol	NOUN	NN	Number=Sing	5	nsubj	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
5	H.	H.	PROPN	NNP	Number=Sing	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | Hydrogen's symbol | H. |  |  |  |  | tree rules |

## Example 7 {#x7}

<!-- .ven lang=en -->
Old airships were filled with hydrogen, which is dangerous because it burns.

```conllu
# sent_id = dict:school:hydrogen:x7:1
# text = Old airships were filled with hydrogen, which is dangerous because it burns.
1	Old	old	ADJ	JJ	Degree=Pos	2	amod	_	_
2	airships	airship	NOUN	NNS	Number=Plur	4	nsubj:pass	_	_
3	were	be	AUX	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	4	aux:pass	_	_
4	filled	fill	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	with	with	ADP	IN	_	6	case	_	_
6	hydrogen	hydrogen	NOUN	NN	Number=Sing	4	obl	_	SpaceAfter=No
7	,	,	PUNCT	,	_	10	punct	_	_
8	which	which	PRON	WDT	PronType=Rel	10	nsubj	_	_
9	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	10	cop	_	_
10	dangerous	dangerous	ADJ	JJ	Degree=Pos	6	acl	_	_
11	because	because	SCONJ	IN	_	13	mark	_	_
12	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	13	nsubj	_	_
13	burns	burn	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	10	advcl	_	SpaceAfter=No
14	.	.	PUNCT	.	_	4	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **fill** | past · passive |  | Old airships |  |  |  | with hydrogen | vn other\_cos-45.4 «NP V NP PP.instrument»: subject=Patient with hydrogen=Instrument |
| 2 | **is** | present | hydrogen |  |  |  |  | dangerous *property* | tree rules |
| 3 | **burn** | present | hydrogen |  |  |  |  |  | vn light\_emission-43.1 «NP V»: agent=Theme |

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**Text:** the school dictionary of Mova's schools (`world/data/dictionary-schools/`), written for Mova. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each meaning and example read on its own. Elamur Cosmic License.

<!-- /div -->

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