Page 28 - 新思维科学学生用书7 样章

2.1 Solids, liquids and gases

Looking at states of matter

Everything you can see and feel is called matter. Scientists
sort matter into three groups or states called ‘solids’, ‘liquids’
and ‘gases’. These states of matter behave in different ways.

The ways they behave are called their properties.

Solids

Solids keep the same shape. Solids take up the same amount

of space. Solids keep the same volume. Solids cannot be
compressed (squashed) or poured.

Liquids

cm 3
Liquids take the shape of the container they are in. Liquids 100
can be poured. Liquids cannot be compressed. Liquids take 90
80
up the same amount of space, whatever the shape of their 70
container. 60

50
The volume of a liquid does not change.
40
30 cm 3
100
3
Gases 20 50cm of liquid 80
60
10 40
Gases flow like liquids. They will fill any closed container 20
they are in.

Gases are very easy to compress. The volume of a gas can

change. Gases weigh very little. Generally, you cannot see or
feel gases, but you can sometimes smell them, and you can
feel air moving on your face.

50 50 50
40 40 40
water 30 air 30 30
20 20 20
10 10 10

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