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Greek B:,, U = universal constant in Equa-= molecular weight = pressure, lb./sq. in. abs. =: critical pressure, lb./sq. in. abs. = critical pressure of reference substance 2 , lb./sq. in. abs. = reduced pressure, dimensionless = critical temperature, O K . = reduced temperature, dimen-= temperature, "C. tion (3) sionless Letters = viscometer constant at temperature and pressure, sq. cm./ sec.' = viscometer constant corrected to 0°C. and 0 pressure, sq. cm./sec.' = fall time interval, sec. = absolute viscosity, poise = density of fluid, g./cc. = critical density of fluid, g./ = density of the falling body, cc.g./cc.

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