Convection, Conduction, Radiation Grade 8 Science
Storyboard Text
- Suns Radiation
- Suns Radiation
- Suns Radiation
- Radiation occurs when heat is transferred to other particles without direct contact. Electromagnetic waves can heat up a material without needing to touch it. The more energy (the hotter) the particles have the more heat energy radiation they will give off.
- For example, when the sun radiates heat energy the ice-cream in the girls hand will absorb some of this energy and begin to melt.
- For example, when a pot of water is boiling on the stove the water closest to the heat source (the stove) will heat up and rise forcing the cooler water at the top to sink. The cool water will heat up and rise, forcing the now cool water to sink. This creates an infinite loop.
- Convection occurs when a substance is heated, it will rise. When it cools again it will sink, creating a circular motion.
- The cool air will sink and the hot air will rise.
- For example, if you hold a metal rod above a lit candle it will heat up. As metal is a good conductor the heat will travel up the rod towards your hand. As the flame is touching the rod it therefore a conduction of heat.
- Conduction occurs when heat is transferred through a material via direct contact.
- Metals are very good conductors of heat.
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