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Conduction and Convection - Lesson 3
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What is an example of a convection current?
A hot air balloon Greenhouse effect
Explain a convection current
Air moving in a circle: warming, being pushed up, cooling, sinking, then warming again
Air can move in a circle called a ______________________
Convection current
True or False: Hot air rises since it is less dense.
True. Hot air rises Think about hot upstairs is sometimes warmer than downstairs
Hot air is (more or less) dense than cool air
Hot air is LESS dense than cool air
Cool air from the kitchen will enter the oven to be __________
Warmed up
Explain how convection works when you open the door of a warm oven
When you open the oven door, warm air particles inside move upward into the rest of the kitchen. Cool air in the kitchen will enter the oven and be warmed
In convection, a __________ or __________ moves from place to place
Gas or liquid
True or False: Hot soup warming a cold spoon is an example of conduction.
True
A warm hand warming a cold glass of lemonade is an example of what?
Conduction
True or False: Convection is the transfer of thermal energy when objects touch?
False! Convection is the transfer of thermal energy as matter moves
What is the transfer of thermal energy as matter moves?
Convection
When the oven is on and it makes the kitchen hot, heat moves through the room from _______________
Convection
An ______________ is a substance through which heat does not easily flow from particle to particle (like wood or plastic)
Insulator
A ___________ is a substance through which heat is easily transferred (like metal)
Conductor
___________ the transfer of heat that occurs when one thing touches another
Conduction
Give another example of conduction (besides the head and pillow example)
Thermal energy transfers from: a warm bird to cooler eggs on a nest a hot mug of coffee on your cool hands the hot concrete on your cool feet at Mimi's pool
True or False: Conduction is the transfer of heat that occurs when one thing sits next to another?
False! Conduction is the transfer of heat when one thing TOUCHES another
When solids like your head and pillow touch (and transfer thermal energy), how does the energy move by?
Conduction
Explain how thermal energy is transferred when you put your head on a cool pillow.
Thermal energy is transferred from your body (which is warm) to the pillow (which is cool).
Thermal energy flows from something _____ to something _____.
warm to cool
Heat is a form of ____________
energy.
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