Welcome!

This is a blog of the 4th grade class in la Farigola de Vallcarca School in Barcelona. This year we are doing “Aula de Ciències” in English.
In this blog we want to show you the experiments we do in our Science Lab. Science is fun!


dilluns, 26 de març de 2012

The candle goes out

MATERIALS:
- A candle
- A plate
- A glass
- Matches or a lighter
- Water


INSTRUCTIONS:
- Place the candle on the plate.
- Pour some water into the plate.
- Light the candle.
- Put the glass upside down on the plate.
- Look at the flame and the water in the glass.


The flame goes out and the water level in the glass rises.


WHY?
The candle flame heats the air in the glass, and this hot air expands. Some of this hot air escapes out from under the glass  (you can see some bubbles). When the flame goes out, the air in the glass cools and contracts. The cool air inside of the glass creates a vacuum due to the low pressure inside the glass and the high pressure outside of the glass. 



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