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Year 415 · Gases of Many Kinds
KO

Year 4 · seventh unit

Gases of Many Kinds

Air is not one thing. Several gases are mixed in it, and each does something different.

A child with a balloon, and a jar with a candle in it

I poured gas into a jar with a candle in it

A board to adjust

What makes it flare up when poured in, and what puts it out? Watch the limewater beside it too.

A hand pouring gas into a jar with a candle in it

I took a balloon deep under water

A board to adjust

What will happen to the balloon? Drag the child down to 30 m.

A child diving down with a balloon

I put a dented table-tennis ball in hot water

A board to adjust

Will it pop back out? Change the temperature of the water.

A dented table-tennis ball in hot water

From here squashing and swelling get numbers

What comes next in middle school · the properties of gases

How much when pressed, how much when heated

It is the balloon you took under water above. Put numbers on the pressure and the temperature and the volume can be worked out exactly. Inside, particles are bouncing about.

Particles bouncing about inside a balloon, on dark paper

The balloon from above

A board to adjust

This time the pressure and the temperature have numbers.

1 atmpressure
20℃temperature

Back up to the basics