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Heat Review II

science test

QuestionAnswer
Heat The transfer of thermal energy
Conduction The transfer of thermal energy through a solid (by contact - the particles bump each other
Convection The transfer of thermal energy through a liquid or gas - uses flowing particles called convection currents
Radiation The transfer of thermal energy from a light source (it travels using electromagnetic waves)
Good conductors any metal - copper, aluminum, steel, silver, gold
What happens when the flame reaches the fork it goes out because the energy is conducted away by the metal fork
Insulators A poor heat conductor - they trap air and slow down heat loss from conduction
5 Insulator examples Wood, rubber, goose down, styrofoam, clothing, paper towel
6 parts of a convection current 1. the atoms gain energy, 2. move faster, 3. spread apart, 4. become less dense (lighter) 5. they rise 6. Cool, more dense air replaces the hot air that rose.
Two examples of ocean convection currents The Gulf Stream, The East Australian Current
3 things all radiation waves have in common they're all waves, they can be reflected or absorbed, and they all travel at the speed of light
Absorb When radiation is absorbed the atoms gain energy and move faster
Reflect When radiation is reflected, no energy is gained or lost.
Why is a Solar heater black so it will absorb the solar radiation.
Black and silver cans - Which heats up faster The black can will heat up faster because it absorbs the radiation from the heater, while the silver can relects the radiation.
Calorie a unit used to measure thermal energy (heat)
Recommended # of calories a day for men and women Men need 1500-2000 calories Women need 1200-1500 calories
food calorie a kilocalorie (1000 calories) - the amount of energy needed to raise a liter of water by 1 degree celsius
How do we find out how many calories are in our food? We burn it and measure how much heat is released
Created by: devon science
 

 



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