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Heat transfer
by

## Christine Russell

on 1 March 2014

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#### Transcript of Conduction, convection, and radiation

Quels sont les sources de chaleur à la plage?
Conduction
Definition: the transfer of thermal energy across a substance or between two substances that
touch
. This transfer happens when particles hit each other.
Examples: When a kettle touches a stove element;
when hot water touches a cup.
Metals are good conductors so they're often used to make products in your house.
Insulators are used to make products that prevent energy transfer (e.g, plastic, rubber, cotton, etc.)
Convection
Definition: the transfer of thermal energy from one part of a liquid or gas to another part. This transfer is caused by the circulation of slow and fast particles.
Examples: When you heat up soup (hot soup moves toward the surface and cold soup sinks to the bottom);
Hot air rises towards the roof and cold air falls to the ground.
Definition of radiation energy: energy that travels in empty space in the form of electromagnetic
waves
. Examples: light, ultraviolet rays, infrared rays.
Examples: the Sun, the rays in a micro-wave, a fire, light from a lightbulb
Your turn! Identify whether the following examples are conduction, convection or radiation;
a) baking cookies in the oven
b) making pancakes in a fry pan
c) grilling meat on a BBQ
Conduction: Thermal energy is transferred when the metal grill touches the meat.
Radiation: Thermal energy is transferred when the fire warms the food.
Convection: Thermal energy is transferred when the lid is closed and hot air circulates.
Conduction: L`énergie thermique est transférée quand la poêle à frire touche le mélange à crêpe.
Conduction: Thermal energy is transferred when the baking sheet touches the cookie batter.
Convection: Thermal energy is transferred when the hot air in the oven circulates.
Radiation: Thermal energy is transferred when the heating element becomes hot.
Energy transfer:
Thermal energy travels on it's own when hot particles in one substance hit cold particles in another substance. It always begins with the movement of the hot particles.
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