--- title: Keeping warm and keeping cool: insulation and sweat — a lesson of Mova's school · trees and pragmatics description: «Keeping warm and keeping cool: insulation and sweat», a lesson of the physics course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: A woolly jumper does not make any heat; your body makes it, and the jumper traps still air between its fibres, which p --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Physics](https://md.mova.elamur.ai/free/en/corpora/school/physics/) / Keeping warm and keeping cool: insulat… # Keeping warm and keeping cool: insulation and sweat Lesson 25 of the physics course of Mova's primary school: 17 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/physics/25-keeping-warm-and-keeping-cool/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/0/) — A woolly jumper does not make any heat; your body makes it, and the jumper traps still air between its fibres, which passes heat very badly, so the heat stays in. - [1](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/1/) — Insulation slows heat moving either way, so the same coat that keeps you warm would keep a snowman cold, and the same flask keeps tea hot and juice cold all day. - [2](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/2/) — To cool down, bodies use a trick: when water dries off the skin it takes heat with it, so sweat cools you, and stepping out of the pool on a warm day makes you shiver. - [3](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/3/) — Dogs hardly sweat, so they pant to dry their wet tongues, and elephants flap their huge thin ears so the blood inside gives its heat to the air. - [4](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/4/) — Sunlight pours into a parked car through the glass, but the warmth from the seats cannot get out easily, so the car gets dangerously hot inside, far hotter than the air outside. - [5](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/5/) — Wool, fur and fluffy materials keep heat in by trapping still air, which passes heat very badly. - [6](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/6/) — Insulation slows heat flow in both directions, so a coat wrapped round a snowman makes it last longer. - [7](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/7/) — A polar bear stays warm in the Arctic with thick fur and a layer of fat, and its skin under the pale fur is black. - [8](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/8/) — A flask has two walls with almost no air between them, so heat can hardly cross, and shiny walls bounce heat rays back. - [9](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/9/) — Thick walls, fluffy loft insulation and double windows slow heat leaking out of a house, so it needs much less fuel to keep warm. - [10](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/10/) — Sweat cools you because as it evaporates it takes heat from your skin; on a very humid day it cannot evaporate well, and you feel hot and sticky. - [11](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/11/) — You feel cold getting out of a pool, even on a warm day, because the water on your skin evaporates and carries heat away, and wind makes it faster. - [12](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/12/) — Dogs hardly sweat, so they cool down by panting, which dries their wet tongue and mouth. - [13](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/13/) — A car parked in the Sun gets much hotter inside than outside, and a dog must never be left in one, because it gets dangerously hot in minutes. - [14](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/14/) — A greenhouse stays warm in the same way as a parked car: light gets in easily, but the warmth cannot escape well. - [15](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/15/) — An elephant's big thin ears are full of blood vessels and give off heat like radiators when it flaps them. - [16](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/16/) — Desert foxes have big ears that help them lose heat, while Arctic foxes have small ears that keep heat in. - ← previous: [Melting, freezing and boiling](https://md.mova.elamur.ai/free/en/corpora/school/physics/24-melting-freezing-and-boiling/) - next →: [Static electricity: balloons, hair and sparks](https://md.mova.elamur.ai/free/en/corpora/school/physics/26-static-electricity-balloons-hair-and-sparks/) - ↑ back to [Physics](https://md.mova.elamur.ai/free/en/corpora/school/physics/)