1. Measuring
temperature
Dolors Almeda School
(Cornellà de Llobregat)

2. How do we measure
temperature?
Using a
thermometer.

3. Let’s make a
thermometer!

4. What do we
need?

5. A small bottle of water with a hole
in the lid.
hole

6. A transparent straw

7. Clay

8. Ink

9. Water

10. A hairdryer

11. A bowl with iced water.

12. Fill the bottle (halfway) with water.

13. Add a few drops of ink.

14. Put the straw through the hole and
clay around it.
straw
clay

15. Mark the line the water rises to in
the bottle.

16. Blow hot air on the bottle.

17. Then cool the bottle.

18. What happens?

19. Liquids...
• Expand when they are heated.
• Contract when they are cooled.

20. The mercury...
• ... is the liquid in the thermometer.
• ... contracts when it is in contact with
something colder than it is.
• ... expands when it is in contact with
something warmer than it is.