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TGLA1: Language Alerts
All the ‘Language alerts’ in ‘Stuff & Substance’ are listed on the following pages.

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Teachers’ Guide
LA1 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’.

Freezing is the reverse of melting.
A2.2 TGA3
LA2 • 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 be in.

The state of a substance depends on its temperature and on the melting point and boiling point of the substance.
D1.2 TGD1


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