The Alka-Seltzer fizzes when in water, releasing gas. This gas builds up in the canister until the pressure is too great and...

At home 11-14 14-16

The hot water raises the temperature - the pressure increases and the molecules spread out (some leave the bottle). When the...

At home 11-14 14-16

I ddechrau mae aer yn gwasgu i'r un graddau ar y dŵr sydd yn y botel a'r gwelltyn, ond mae rhoi'r balŵn llawn aer dros geg y...

Adnoddau Cymraeg 5-11 11-14

The balloon stays inflated! As the balloon expanded, it pushed air out of the bottle. That made the pressure inside the bottle...

At home 11-14 14-16

The marshmallows should grow to become much larger. When you release the stopper they should collapse to their previous size.

Enrichment Activity 5-11 11-14

The bottle is already full of air, so it's very hard to blow more air into it. When you do blow into the bottle the air comes...

Enrichment Activity 5-11 11-14

Your hands warm the cold air inside the bottle, making it expand and force the coin off the bottle and into the air!

Enrichment Activity 5-11 11-14

Air presses down equally on the water in the bottle and in the straw at first, but attaching the inflated balloon increases...

Enrichment Activity 5-11 11-14

Tiny pockets of gas in the soap expand in all directions, pushing the soap into strange and artistic shapes.

At home 11-14 14-16

When air moves, its pressure falls. So when you blow, the pressure at the top of the straw drops. But the air over the saucer...

At home 11-14 14-16

The small balloon’s surface is very curved, so most of the tension in the rubber squeezes down on the air, increasing its...

Enrichment Activity 5-11 11-14