Gravity free water when the water in a jar is turned upside down but it does not flow out even though there's no lid to hold it in.
How does it happen?
Well, we filled a jar with water and put a cardboard on top. We then turned it upside down and surprisingly the water stayed in the jar.
With no air inside the glass, the air pressure from outside the glass was greater than the pressure of the water inside the glass. The extra air pressure managed to hold the cardboard in place, keeping us dry and the water where it should be, inside the glass. Amazing!!
Room 6, I remember doing this when I was at primary school. It was so much fun thinking that the water would fall out - but we were wrong.
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