---
title: A balloon shrinks in the freezer and grows again when warmed, becaus… — Pressure tricks: pumps, tyres and vacuums · tree and pragmatics
description: A balloon shrinks in the freezer and grows again when warmed, because cold air pushes less on the rubber. Who acts: balloon, cold air. A sentence of the lesson «Pressure tricks: pumps, tyres and vacuums» of the physics course of Mova's primary school with its dependency tree and the pragmatics of ev
---

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# Pressure tricks: pumps, tyres and vacuums, sentence 14

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A balloon shrinks in the freezer and grows again when warmed, because cold air pushes less on the rubber.

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**Who acts:** balloon, cold air · **What happens:** shrink, grow, warm, push · **To what, where:** freezer

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This is a sentence of the lesson «Pressure tricks: pumps, tyres and vacuums» of the physics course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (balloon, cold air), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:physics:016-pressure-tricks-pumps-tyres-vacuums.lesson:14
# text = A balloon shrinks in the freezer and grows again when warmed, because cold air pushes less on the rubber.
# source = school lesson (ours)
# course = physics
# lesson = 016-pressure-tricks-pumps-tyres-vacuums.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R6-punct-agree ×1
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	balloon	balloon	NOUN	NN	Number=Sing	3	nsubj	_	_
3	shrinks	shrink	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	in	in	ADP	IN	_	6	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	freezer	freezer	NOUN	NN	Number=Sing	3	obl	_	_
7	and	and	CCONJ	CC	_	8	cc	_	_
8	grows	grow	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	_
9	again	again	ADV	RB	_	8	advmod	_	_
10	when	when	ADV	WRB	PronType=Int	11	advmod	_	_
11	warmed	warm	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	8	advcl	_	_
12	,	,	PUNCT	,	_	16	punct	_	_
13	because	because	SCONJ	IN	ExtPos=ADP	16	mark	_	_
14	cold	cold	ADJ	JJ	Degree=Pos	15	amod	_	_
15	air	air	NOUN	NN	Number=Sing	16	nsubj	_	_
16	pushes	push	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	8	advcl	_	_
17	less	less	ADV	RBR	Degree=Cmp	16	advmod	_	_
18	on	on	ADP	IN	_	20	case	_	_
19	the	the	DET	DT	Definite=Def|PronType=Art	20	det	_	_
20	rubber	rubber	NOUN	NN	Number=Sing	16	obl	_	_
21	.	.	PUNCT	.	_	3	punct	_	Agree=R6-punct-agree|Haiku=8:punct
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: changed polarity=none

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **shrink** | present | a balloon |  |  | the freezer |  |  | vn bend-45.2 «NP.patient V»: agent=Patient |
| 2 | **grow** | present | a balloon *not said here* |  |  |  | again |  | vn appear-48.1.1 «NP V»: agent=Theme |
| 3 | **warm** | participle | a balloon *not said here* |  |  |  |  |  | vn other\_cos-45.4 «NP.patient V»: agent=Patient |
| 4 | **push** | present | cold air |  |  |  |  | on the rubber; less *property* | vn push-12-1-1 «NP V PP-Conative»: agent=Agent on rubber=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.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:physics:016-pressure-tricks-pumps-tyres-vacuums.lesson:14`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R6-punct-agree ×1. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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- ← previous: [Pressure tricks: pumps, tyres and vacu…, 13](https://md.mova.elamur.ai/free/en/corpora/school/physics/16-pressure-tricks-pumps-tyres-vacuums/13/)
- next →: [Pressure tricks: pumps, tyres and vacu…, 15](https://md.mova.elamur.ai/free/en/corpora/school/physics/16-pressure-tricks-pumps-tyres-vacuums/15/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/physics/16-pressure-tricks-pumps-tyres-vacuums/)

