4. Define atmospheric pressure & frequency.
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I don't know coorect see in geogle
frequency is also known as amplitude
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That pressure is called atmospheric pressure, or air pressure. It is 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. ... Meteorologists describe the atmospheric pressure by how high the mercury rises.
Frequency: the rate at which something occurs over a particular period of time or in a given sample.
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