the ‘Language alerts’ in ‘Stuff & Substance’
are listed on the following pages.
of main content
In everyday language
we usually use the word freezing to mean very cold because
we associate it with ice. Here we are using it in the
scientific sense: freezing is not about ‘being
cold’, it is about ‘cooling
below the melting point’.
• In everyday
language we often use phrases like ‘Oxygen is
a gas’. We should say, ‘Oxygen is
in the gas state at room temperature’.
• Solid, liquid and gas are not
three separate types of substance, they are the three
states a sample of any substance could
The state of a substance depends on its temperature
and on the melting point and boiling point of the substance.