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Physics
Classical Physics
Mechanics
Hydrostatic behaviour - water in tube
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[QUOTE="kuruman, post: 6220332, member: 192687"] Yes. For the water not to spill, the pressure on the water-air interface due to the weight of the column must be less than atmospheric pressure. The diameter has nothing to do with it. The condition is ##\rho_{water}gh<p_{atm}##. Solving for the height of the column, we get ##~h<\dfrac{p_{atm}}{\rho_{water}g}.## With ##\rho_{water}=1000 ~\mathrm{kg/m^3}##, ##p_{atm}=100,000~\mathrm{N/m^2}## and ##g=10~\mathrm{m/s^2}##, ##h<10~\mathrm{m}##. This is much less that 48"=1.2 m. It didn't work probably because of faulty procedure. The way to do it is to fill the column to the brim, put a card over the lip and, using your hand to hold the card in place, very quickly invert the column being careful not to spill any liquid. Once the column is upside down, remove your hand holding the card. If the card stays in place, remove it very carefully. I've done this with a 10" cylinder, but never with a 48" cylinder. [/QUOTE]
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Mechanics
Hydrostatic behaviour - water in tube
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