Motive column
Motive column is a height of imaginary column of air that produces a pressure equal to difference of pressure between bottom of downcast & upcast shaft.
So, M = D × [ T(u/c) - T(d/c) ] / T(u/c)
M = Motive column
D = Depth in meter
T(u/c) = Temperature in Upcast (kelvin)
T(d/c) = Temperature in Downcast (Kelvin)
Note : Kelvin = 273 + ⁰C
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