We wish you a happy day, Department of Science & Mathematics

1. Unit 12: Temperature
Lesson 4: Physical Changes
& Temperature
Aaly School (Zoom only)
Grade 3

2. Sometimes Physical Changes
require a temperature
Example: Conversion of Solid,
Liquid and Gas
Introduction

3. Objectives
• To know what Boiling Point, Condensation Point, Melting point and Freezing
point are
• To know the Boiling Point, Condensation Point, Melting Point and Freezing point
of Water
• To know that Boiling Point always equals Condensation Point and that Melting
point always equals Freezing Point

4. Point Definition
Boiling Point Temperature in which a liquid starts to boil
and becomes a gas
Condensation Point
Temperature in which a gas starts to condense
and becomes a liquid
Melting Point Temperature in which a solid starts to melt
and becomes a liquid
Freezing Point Temperature in which a liquid starts to freeze
and becomes a solid

5. Point Temperature (of Water)
Boiling Point 100 degrees Celsius
Condensation Point 100 degrees Celsius
Melting Point 0 degrees Celsius
Freezing Point 0 degrees Celsius

6. Point Temperature (of Water)
Boiling Point 100 degrees Celsius
Condensation Point 100 degrees Celsius
Melting Point 0 degrees Celsius
Freezing Point 0 degrees Celsius
Earlier from Slide 5:
Boiling Point always equals Condensation Point
Melting Point always equals Freezing Point

7. How do the opposites have the same temperature?

8. Point Definition
Boiling Point Temperature in which a liquid starts to boil
and becomes a gas
Condensation Point
Temperature in which a gas starts to condense
and becomes a liquid
Melting Point Temperature in which a solid starts to melt
and becomes a liquid
Freezing Point Temperature in which a liquid starts to freeze
and becomes a solid
Earlier from Slide 4:
The points are only the starting temperature

9. Point Temperature (of Water)
Boiling Point 100 degrees Celsius
Condensation Point 100 degrees Celsius
Melting Point 0 degrees Celsius
Freezing Point 0 degrees Celsius
Earlier from Slide 5:
= and above
= and below

10. Open your printed workbook p113

11. Let’s answer the questions together

12. The End
By: Mathematics & Science
Department
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