Convection

Presentation

•

Science

•

5th - 9th Grade

•

Medium

•

NGSS

MS-PS1-4, MS-ESS2-4, MS-PS3-4

Standards-aligned

Deborah Friedberg

Used 5+ times

FREE Resource

23 Slides • 7 Questions

Convection

When you heat a pot of water what happens?

Multiple Choice

When you heat a pot of water, it

condenses

boils

melts

disappears

Where in the pot does the boiling first begin?

At the top? In the middle? At the bottom?

Poll

The boiling starts at the

top

middle

bottom

all of the above.

Boiling starts closest to the heat source, the bottom.

Red-Orange=hot. Blue-Grey=cool

Multiple Select

The more heat, the more the molecules

expand

slow down

speed up

contract

Remember density?

Less dense substances float.

What do we learn form this graph?

See next slide

Multiple Choice

The graph shows that

as temperature decreases, density decreases

as temperature increases, density decreases.

Multiple Select

When boiling a pot of the water, the water at the bottom becomes

the hottest

more dense

less dense

a gas

a liquid

The water at the bottom becomes hotter and therefore, less dense.

Less dense objects float to the top

Multiple Choice

What will happen to the hotter, less dense water? It will

sink

evaporate

rise

melt

Hot, less dense water rises to the top of the pot.

Cold air is dense.

Dense air sinks.

Multiple Choice

What happens to the cooler, denser water?

it rises

it becomes a solid

it becomes a gas

it sinks

The hot, less dense air rises, while the cooler, denser air falls. This creates a circular, cycle of motion.

The same is true for the air in our homes.

This circular cycle of motion has a name; CONVECTION

Convection

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