1. Basic Processes TemperatureFreezingMelting Boiling Evaporation Condensation

2. We can measure the temperature with a thermometer Temperature is a measure of how hot something is. There are figures on the thermometer. We use the Celsius scale in Hungary. Americans use the Fahrenheit scale in the USA.

3. Freezing When the temperature of the air is 0 °C, water starts freezing and becomes ice. The freezing point of the water is 0 °C.

4. Melting When the temperature of the air is 0 °C, ice starts melting and becomes water again

5. Heat makes water turn into a gas. The gas is called water vapour. The boiling point of the water is 100 °C. Boiling

6. Evaporation When the temperature of the water is near the boiling point, water evaporates.

8. Condensation water vapour begins to change to tiny water dropletswater vapour water the opposite of evaporationevaporation

9. Condensation