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[pavankonchada123]

And also tried to use expression but it is saying expression is not single valued

void_fraction1 :

(1 - (DPMConcentration*1[m^3/kg] / 2300)) / (DPMConcentration*1[m^3/kg] / 2300)

surface_volume:

3.14*1[m^-1] / (CellVolume*1[m^-3]) * (6 * CellVolume*1[m^-3]*void_fraction1 / 3.14) ^ 0.666