If you've ever seen a mercury barometer, the principle is exactly the same. The air pressue inside the container is essentially zero (absolute). the atmospheric air pressure is 14.7 psi absolute. So you have a pressure differential that is trying to push the water into the tank. When your chicken drinks out of the tank a little air slips into the tank, raising the air pressure in the tank; water runs out until the weight of the water once again equals the pressure of the air pushing it up into the tank.
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Today's Featured Article - Major Problems - by Anthony West. Following the aquisition of the two Fordsons to my collection I found that I was struggling to move them about. I had considered the possibility of driving the "F" to and from shows but anything other than local rallies was totaly impractical due to its sedate pace. I had also considered buying a landrover and trailer, but the price of a
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