The ability of the atmospheric pressure hypothesis to link the behavior of barometers with the behavior of siphons and vacuum pumps is an illustration of Internal coherence.
Atmospheric pressure is nothing but the force exerted on a surface by the air above it as gravity pulls it to Earth. Atmospheric pressure is commonly measured with a barometer. At sea level has a mean value of 101,325 pascals (roughly 14.6959 pounds per square inch).
Coherent is nothing but if there are two source and if their frequency and waveform are identical then they are coherent.
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