Mon Prof Augmenté
Three ways heat cooks food
Age 14 · Daily Life
Heat can reach food by touch through hot metal, by hot water or air moving around it, or by invisible rays from something glowing. Most cooking uses one of these three, and often a mix of them.
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In the picture
- Conduction: the hot pan passes heat straight into the egg where they touch
- Convection: hot water rises, cools at the top and sinks, carrying heat around the vegetables
- Radiation: the glowing grill bars send heat across the air gap onto the bread
Examples
- A metal spoon left in hot soup gets hot at the handle by conduction
- A fan oven blows hot air around a cake so it bakes evenly by convection
Key takeaways
- Conduction needs contact, convection needs a moving liquid or gas, radiation needs neither
- Radiation is how the Sun’s heat crosses empty space to reach Earth
Quiz: Three ways heat cooks food (Age 14)
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A pancake cooks where it touches a hot frying pan. How is the heat mainly reaching it?
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What does convection need in order to carry heat to food?
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How does the Sun’s heat reach Earth across empty space?
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