Presentation on theme: "Conduction CONDUCTION is when heat moves through a ________. Metals are better conductors of heat than plastic or wood. This is why… These parts are."— Presentation transcript:
1 ConductionCONDUCTION is when heat moves through a ________. Metals are better conductors of heat than plastic or wood. This is why…These parts are made of plastic or wood:These parts are made of metal:
2 ConductionIn this experiment we saw that liquid water is a poor conductor of heat. The ice cube did not melt even though the water above it was boiling.Air is also a poor conductor of heat. This is how many types of house insulation and clothing keep us warm.
3 Words to use: expands, radiators, dense, heated, current, float ConvectionConvection is all about when a gas or liquid (“fluid”) moves and carries heat with it. When the fluid is heated it ____________. This means that it will become less __________ than the colder fluid around it. Because of this the warmer fluid will try to “_______” over the colder fluid, and this is why warm air rises. This is called a convection ___________. This is how heat reaches us from the ___________ in this room.Words to use: expands, radiators, dense, heated, current, float
4 Words – sun, absorbs, nothing, warmer, waves RadiationWhen you wear a black t-shirt on a hot, sunny day you would feel ______ than if you wore white. This is because black ________ infrared radiation (i.e. heat) from the sun better than white does.I’m cool!I’m very hot!Conduction is when heat travels through a solid and convection happens in a liquid or gas, but radiation can happen through absolutely ________ because the heat is moving by ______. This is how heat reaches us from the ____.Words – sun, absorbs, nothing, warmer, waves
5 Heat and TemperatureHeat is a type of energy that will flow from a warm area to a colder one. For example…This cup of coffee will ____ ____ because it is _____ ____ heat energy into the surroundings.This drink (taken out of the fridge) will _____ ___ because it is _____ ___ heat energy from the surroundings.Words – giving out, warm up, taking in, cool down
6 Heat energyHow much heat energy an object has depends on its temperature AND how much of it there is…The sparkler is at a higher temperature than the bath, but the bath is MUCH heavier, so it has more heat energy.
7 Particle theory revision Particle theory is all about explaining the properties of solids, liquids and gases by looking at what the particles do.View animationSOLIDSIn a solid the particles ______ around a _____ position. There is a ______ force of attraction between each particle and they are very _____ togetherWords – strong, close, vibrate, fixed
8 Words – fixed, collide, quickly, close, very, solids LIQUIDSGASESIn a liquid the particles are _____ together but can move in any direction. They won’t keep a _____ shape like _____ do.In a gas the particles are very far apart and move _____ in all directions. They often ______ with each other and because they are far apart they can be easily _______.Words – fixed, collide, quickly, close, very, solids
9 Changes of StateWhat are these processes called? Choose from freezing, evaporating, melting, condensing
10 Heating iceTemp/OC15010050-50This flat line shows where energy is being used to push the particles further apart for evaporationThis flat line shows where energy is being used to break bonds – this has to be done during meltingTime/s