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Convection and radiation...and conduction

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by

Harvey Buckle

on 9 April 2018

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Transcript of Convection and radiation...and conduction

Convection and radiation...and conduction
Aim
To know the principles of conduction, convection and radiation
To demonstrate convection
To suggest everyday examples of radiation and convection
To answer related questions
Conduction, convection and radiation
Run your hand under the tap for 2 minutes. Hold it wet in the open air...what is happening?
The two C's and R
Heat can be transferred from place to place by conduction, convection and radiation. Dark matt surfaces are better at absorbing heat energy than light shiny surfaces. Heat energy can be lost from homes in many different ways and there are ways of reducing these heat losses.
Now
Starter
How hot is:

1. The sun
2. A car engine inside
3. Your fridge
4. The coldest possible temperature
5. The hottest ever temperature on earth
6. Venus

CSI - heat!
Convection
Liquids and gases are fluids. The particles in these fluids can move from place to place. Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection.
Radiation
All objects give out and take in thermal radiation, which is also called infrared radiation. The hotter an object is, the more infrared radiation it emits.

Light from the sun reaching earth
Infrared radiation is a type of electromagnetic radiation that involves waves. No particles are involved, unlike in the processes of conduction and convection, so radiation can even work through the vacuum of space.
1. Describe, with examples, which surfaces are good at absorbing or reflecting or stopping heat...make a 1 minute presentation
Practical time!!!!
Full transcript