Question

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What is Atmospheric Pressure? 1ATP = how many Pascal?

Answer 1

Atmospheric pressure is the pressure exerted by the weight of the atmosphere.

1 ATP = 1.013 x 10^5 N/m

Answer 2

Atmospheric pressure, some times also called barometric pressure, is the pressure within the atmosphere of Earth. In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point.
1ATP= 1 pascal