I see people put one end of a tube in some water and then suck the other end, and then the water seems to flow out of the tube on its own? Shouldn’t there be an external force pulling the water out?
In: Physics
The weight of the water does the pulling.
As long as there’s a steady flow of water through the tube gravity and the water itself does all the work.
Think of it like this, a four foot long hose is used and marked with four different colors, each one foot long.
If the red section of the tube is full of water and then that water moves down to the green section, what’s left in the red section? It can only be filled by more of the water from the container.
Each small amount of water through the hose pulls an equal amount of water behind it. That’s because the space has to filled with something, and if no air is available, water is the only available option.
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