b. What is atmospheric pressure ? What is its value at the sea level ?
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the pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101,325 pascals
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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. Standard sea-level pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, 1,013.25 × 103 dynes per square centimetre, 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals.
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