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# Convection

### Study these terms and descriptions to prepare for your next quiz.

Cold air or cold water always __________. sinks
Warm air or warm water always __________. rises
A convection current is _________________________. the continuous rising of warm fluids and sinking of cool fluids.
What is the cycle in which hotter, less dense fluids rise and cooler, more dense fluids sink called? convection
Cold air or cold liquids always sink because__________. they are more dense.
Warm air or warm liquids always rise because__________. they are less dense.
The air by the ceiling is the warmest because ________________. it is less dense and rises.
Can convection happen in water? Yes
What is thermal equilibrium? When a substance is equally heated and at the same temperature.
How does a pot of water come to a boil? Water on the bottom of the pan is heated, then rises. Cold water at the top sinks and then is heated.
Which is more dense? Cold air or warm air? cold air
Why do air conditioners work better when they are placed in the ceiling of a room? The cold air flows down to cool the room and the warm air rises to get cooled off.
Does convection occur in the air? Yes
What does convection occur in? fluids - either gasses or liquids
Convection is a ________________________. cycle of warm fluids rising and cool fluids sinking.
What is the amout of matter (atoms) in an object called? mass
What is the amount of space an object takes up called? volume
What is the amount of mass in a volume called? (Or the amount of "stuff" packed into an object called) density
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