--- title: Thinking it through: the science behind home safety — a lesson of Mova's school · trees and pragmatics description: «Thinking it through: the science behind home safety», a lesson of the everyday course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Every safety rule at home has a reason in science, and when you know the reason you can work out what to do even in a --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/) [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/) / [Everyday](https://md.mova.elamur.ai/free/en/corpora/school/everyday/) / Thinking it through: the science behin… # Thinking it through: the science behind home safety Lesson 40 of the everyday course of Mova's primary school: 28 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/everyday/40-home-safety-reasoning/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/0/) — Every safety rule at home has a reason in science, and when you know the reason you can work out what to do even in a situation nobody taught you. - [1](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/1/) — A fire needs three things: heat, fuel and oxygen from the air. - [2](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/2/) — Take away any one and it goes out. - [3](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/3/) — A lid on a burning pan works because it cuts off the oxygen. - [4](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/4/) — Water on burning oil is a disaster. - [5](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/5/) — Water is heavier than oil, so it sinks under the hot oil, boils at once into steam, and steam takes up about 1,700 times more room than the water did. - [6](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/6/) — It bursts up and flings burning oil into the air as a fireball. - [7](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/7/) — Bacteria grow fastest in warmth, between about 40 °F and 140 °F (5 °C and 60 °C). - [8](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/8/) — In good conditions their number can double every 20 minutes, so one becomes 64 in two hours, and some make poisons that cooking does not destroy. - [9](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/9/) — Hot air and smoke are less dense than cool air, so they rise like a hot-air balloon and fill a room from the ceiling down. - [10](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/10/) — Gases you cannot see or smell, like carbon monoxide, are found only by an alarm. - [11](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/11/) — A family in Pennsylvania had no working smoke alarm; a fire started at night in the living room, and by the time they woke the stairs were full of smoke. - [12](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/12/) — A toddler in Brisbane climbed a chest of drawers that was not fixed to the wall; it tipped over on top of him, and he was hurt. - [13](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/13/) — A fire needs heat, fuel and oxygen; taking away any one puts it out. - [14](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/14/) — Heat, fuel and oxygen are called the fire triangle; a fire blanket, a thick sheet put over a small fire, works like a lid and takes away the oxygen. - [15](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/15/) — A closed door limits the fresh air that feeds a fire, so it slows the fire down. - [16](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/16/) — Water is denser than oil, so it sinks under burning oil. - [17](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/17/) — When water turns to steam it takes up about 1,700 times more space. - [19](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/19/) — A burning pan must never be carried, because moving it can splash burning oil and spread the fire. - [20](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/20/) — A pan fire is put out by turning off the heat and covering the pan with a lid, which only an adult should do. - [21](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/21/) — Hot smoke is less dense than cool air, so it rises and fills a room from the ceiling down. - [23](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/23/) — In good conditions some bacteria can double their number every 20 minutes. - [24](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/24/) — Some bacteria make poisons that are not destroyed by cooking. - [26](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/26/) — Carbon monoxide is a poisonous gas with no colour and no smell, so homes with fuel-burning heaters or boilers need a carbon monoxide alarm. - [27](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/27/) — Ice on a burn can damage the skin further, while cool running water cools it gently. - [28](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/28/) — Water that is too hot can scald a baby's thin skin in a few seconds. - [29](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/29/) — Furniture and televisions that tip over injure many young children every year. - [30](https://md.mova.elamur.ai/free/en/corpora/school/everyday/40-home-safety-reasoning/30/) — A working smoke alarm can give you the few minutes you need to escape a fire. - ← previous: [Time, routines and sleep](https://md.mova.elamur.ai/free/en/corpora/school/everyday/39-time-and-routines/) - next →: [Crossing the road](https://md.mova.elamur.ai/free/en/corpora/school/everyday/41-crossing-the-road/) - ↑ back to [Everyday](https://md.mova.elamur.ai/free/en/corpora/school/everyday/)