Concentration of salt of salt or solid particles in fluid or soil

Symbol

SI units

Oil metric units

Oil field units

Additional

Sal

–

‰

frac = 10^-3 ‰ = 10^-6 ppm

‰ = ppk = ppt = 1,000 ppm

wt% = 10,000 ppm = 10 ‰ = 0.01 frac

^*mg/L= 1 ppm = 0.01 wt% = 0.001 ‰

^* In engineering practice, the Salinity is often measured in [ mg/L ] = 0.001 ‰ but this is misnomer as the right-hand side is dimensionless quantity whereas the left-hand expression has a physical meaning of the density.

The relation between the two has only sense for water at melting point which has a unit density.

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