1. EVAPORATIONEVAPORATION
isis the process of heating waterthe process of heating water
to form a vapourto form a vapour
Mª Teresa Villarroya i FontMª Teresa Villarroya i Font

2. WHAT IS EVAPORATION?WHAT IS EVAPORATION?
• Evaporation is a process, a change.Evaporation is a process, a change.
• It’s the heating process that changesIt’s the heating process that changes
liquid into a gas.liquid into a gas.

3. RATES OF EVAPORATIONRATES OF EVAPORATION
• Wind :the higher the wind speed, the moreWind :the higher the wind speed, the more
evaporation.evaporation.
• Temperature: the higher the temperature, theTemperature: the higher the temperature, the
more evaporation.more evaporation.
• Humidity: the lower the humidity, the moreHumidity: the lower the humidity, the more
evaporation.evaporation.
• Area: the bigger the area, the more evaporationArea: the bigger the area, the more evaporation

4. www.sanbrunowater.ca..gov/tech.htm

5. LOOK AT THE CLOTHES ONLOOK AT THE CLOTHES ON
THE WASHING LINE.THE WASHING LINE.
• What has happened?What has happened?
• Why has it happened?Why has it happened?
• How do we call the process?How do we call the process?

6. LOOK AT THE WATER INTOLOOK AT THE WATER INTO
THE PAN.THE PAN.
• What has happened?What has happened?
• Why has it happened?Why has it happened?
• What do we call the process?What do we call the process?
• Where is the water, now?Where is the water, now?

7. LOOK AT THE WOMAN.LOOK AT THE WOMAN.
• What has happened?What has happened?
• Why has it happened?Why has it happened?
• What do we call the process?What do we call the process?
• Water has turn into …….Water has turn into …….
• Liquid has changed into a ……Liquid has changed into a ……

8. LOOK AT THE PEOPLELOOK AT THE PEOPLE
• Are the conditions good or bad forAre the conditions good or bad for
evaporation?evaporation?
• Why?Why?