When you block one end of a straw why does the liquid stay in place/in the straw?
In: Physics
Vacuum
For a cooler display of how strong the vacuum is, fill a glass completely to the top with water then take a piece of cardboard and hold it on the top of the water filled glass
Hold it in place as you flip the glass upside down, then take your hand away from the cardboard, if done correctly the vacuum in the glass will be strong enough to hold the cardboard onto the glass and hold the water in
It sounds like it shouldnt work and the water will just fall out, but give it a go (over a sink just incase it fails) its a cool little trick
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