Thermal Energy, Temperature, and Heat - Exit Ticket 

I'm going to be covering the entire AQA GCSE physics course this way. So, if you have any questions about it, leave a comment and I will reply to it as soon as possible. Thanks for watching!

Script:
Heat can be transferred from place to place by conduction, convection and radiation. Today though we'll be focusing on radiation. All objects emit and absorb thermal radiation, which is also called infrared radiation. Even we do, just a very low amount, but it can still be picked up by thermal imaging cameras that detect the infrared radiation and convert it to visible light. Like this picture of a hair dryer. The hotter an object is, the more radiation it emits, some of it even becomes visible light that we can see. Infrared radiation is a type of electromagnetic radiation, which has a lower frequency than light and involves waves rather than particles. This means that, unlike conduction and convection, radiation can even pass through the vacuum of space. This is why we can still feel the heat of the Sun, even though it's 150 million km away from the Earth. Some surfaces are better than others at emitting and absorbing infrared radiation. Dark, Matt surfaces are good at emitting and absorbing infrared radiation, which is why solar panels are black in order to absorb the maximum amount heat for your hot shower, while light, shiny surfaces are poor at absorbing and emitting infrared radiation but they ARE good reflectors. Which is how thermos' work, if you want to keep your cup of tea hot all day, you put it in a thermos that is coated inside with a shiny surface to reflect the radiation back to the tea. Or if you don't have one, just wrap it in some tin foil.

Heat Transfer - Radiation | GCSE Physics | Doodle Science

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Script:
Conduction is the transfer of heat between substances that are in direct contact with each other and it mainly happens in solids. The heat is conducted from atom to atom using the kinetic energy of the particles, in other words by vibrating.  The better the conductor, the more rapidly heat will transfer. Have you ever noticed that metal benches tend to feel colder than a wooden ones? Believe it or not, they are not colder! They only feel colder because they conduct heat away from your bottom better than wood and you perceive the heat that is leaving your bum as cold. Metals are particularly good at conducting heat because of their free electrons that move about the structure colliding with the positive ions and transferring the kinetic energy to them. Convection happens in gases and liquids. As a gas or a liquid is heated, it warms, expands, and rises because it is less dense. When the gas or liquid cools, it becomes denser and falls. As the gas or liquid warms and rises, or cools and falls, it creates a convection current, which is what transfers the heat from one place to another. For example when you turn on your radiator, despite the name the room is heated by convection, as the air is heated above the radiator, it expands, rises and the cooler, denser air sinks causing a convection current around the room.

Heat Transfer - Conduction and Convection | GCSE Physics | Doodle Science

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Thermal Energy, Temperature, and Heat - Exit Ticket

Science Resource Description