This week in science club we have been exploring how vacuums work.
We placed a candle floating on water and covered it with a jar and placed the jar on some coins.
As the fire used up all the oxygen it went out. Once it went out we noticed the water level rise inside the jar. Because the flame heated the air inside the jar it expanded, but once the flame was extinguished the air cooled rapidly and condensed. This created a vacuum which sucked the water up into the jar.
What else can you tell me about vacuums?
When might we need to use a vacuum?
What can you tell me about the vacuum in space?