WALA: WHY IS EVAPORATION IMPORTANT?

WALA: WHY IS EVAPORATION IMPORTANT?

L.O: to know that evaporation occurs when a liquid turns into a gas.

INTRODUCTION

LOOK AT PICTURES ON THE NEXT SLIDES.

TALK ABOUT HOW EVAPORATION HAPPENS IN EACH OF THE PICTURES AND HOW IT IS USEFUL.

DRYING YOUR HAIR

GRAPES DRYING ON A RACK IN THE SUN.

USING A THUMBLE DRYER

GIVE OTHER EXAMPLES OF HOW EVAPORATION IS USEFUL

• Paint

• Cement drying

• cooking e.g rice, lentils and maize meal.

ACTIVITY

• USE THREE STUDENTS.

  POUR HAND SANITIZER ON THEIR HANDS.

• Tell them to rub their hands together as if you were washing them.

  What do they notice?

• The hands are dry. The hand sanitizer has evaporated off their hands. The hands feel cool.

• Explain that evaporation is a cooling process.

DISCUSSION

• WHY DO WE SWEAT?

• As the temperature rises, your body begins to produce sweat. As the sweat evaporates, it carries with it some of the heat from your body, causing your body to cool down.

NOTES

- Evaporation helps us to dry things such as washing, our hair, and food.

-Liquids evaporate faster when the air is moving.

PLENARY

Conclude the lesson by going through the main points