1. Week -4 L 1 Presentation LIQUID - IN - GLASS THERMOMETERS

2. Lesson Objectives:
Liquid-in-glass thermometer is made up of using a capillary tube,
In the bottom of the capillary tube there is a bigger container to hold the liquid,
The liquid that is usually used to fill thermometer is mercury or alcohol.

3. What is a liquid-in-glass thermometer?
A liquid -in -glass thermometer is a temperature-measuring instrument consisting of a thin-walled glass bulb (the reservoir for the thermometer liquid) attached to a glass stem (the capillary tube through which the liquid moves with a change in temperature), with the bulb and stem system sealed against its environment.

4. Diagram?
Capillary Tube

5. Students Turn to draw !
Worksheet 1

6. Teacher pose a question
Why Mercury ?
Why Alcohol?
Why not Water?

7. Students do a research
Week 4 L1
Worksheet 2

8. Why Mercury and Alcohol?
Plenary
Objectives achieved?
What is a thermometer?
Parts?
Why Mercury and Alcohol?