Thames & Kosmos Chewing Gum Lab handleiding

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Thames & Kosmos

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Handleiding

2. Finding the volume

of a piece of gum

How can you ﬁnd out how much space

something takes up?

You will need:

A piece of gum, glass jar or drinking

glass, water, pen, tape

Here’s how:

Fill the jar or glass with water.

Use the tape and pen to mark

the top of the water level. Look

closely at the surface of the water.

You will see it curves up slightly

around the sides where it touches

the jar. Place your mark at the

bottom of the curve in the surface

of the water. This curve in the

upper surface of a liquid is called

the meniscus.

Drop a piece of gum into the jar.

What happens to the water level?

Try adding more objects to the jar

of water. Observe what happens

to the water level when you add

them.

GEEK

OUT!

WHAT’S

HAPPENING?

When you place the gum into the

jar, the water level rises. The water

is displaced by the gum, causing

the water level to rise. The amount

of water appears to increase, but

really it is the same amount of

water as before, only now it is

pushed up by the gum. The amount

that the water appears to increase

is actually equal to the amount of

space that the gum takes up. This

amount is called the volume.

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