When we consider a thin horizontal layer of the atmosphere, of thickness dy, of area A, with pressure P on the bottom, with an average mass m per molecule, and nV molecules per unit volume, the magnitude of the difference of the pressure at the top and bottom of the layer is given by dP =
a. mgdy.
b. mgnVdy.
c. mgAdy.
d. mgnVAdy.
e. mgnVAPdy.
b
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