Now to the inclined manometer, shown above, this is just a more complex U tube. One arm of the instrument is a glass tube in a mount to which is attached a scale, in this case a 12 inch ruler, the other arm is a plastic container, a model aircraft fuel tank.
A manometer is used to measure the pressure difference between two gases, often atmosphere and the gas being tested. A typical manometer consists of a U-shaped tube filled with either mercury or liquid.
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