Converting ft/min into mm - Column of Water

See this thread - especially posts #6&7.

Step 1 convert ft/min in m/s

Step 2 h[m] = V[m/s]^2/(2*g[m/s^2])*ρair[kg/m^3]/ρwater[kg/m^3]

This is valid if the fluid flow is air which I presume since with other fluids water will not be used.

This equation comes from the equivalence between the "stop pressure"of a fluid flow and the static pressure of a fluid column.

h is the difference in levels obtained in a U tube. This is the principle of the Pitot tube used to measure flow velocities.

I am sorry but it seems that letters are not any more rightly understood in the equation there should be the ratio between specific air mass and specific water mass and not the ... which appeared.

Please provide more information about what you are trying to determine.