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Parts per Million by Weight in Water This is the concentration for gas, expressed in pounds per millimeter found in water . It's expressed as weight. To determine the concentration by metric units, an estimation of the density of water is required. The density of water that is pure is 1000.0000 kilograms per millimeter 3. at temperatures of 3.98degC and the normal atmospheric pressure at the time of 1969. This was the prior standard definition for the kilogram. The word "kilo" is now defined as being similar to the mass of the prototype that was employed for international use for the kilogram. High-purity water (VSMOW) at temperatures of 4degC (IPTS-68) and the normal atmospheric pressure has at the average density 999.9750 kg/m 3. . [5] Water's density is affected by temperature, pressure as well as impurities i.e. gasses that dissolve as well as the salinity of water. A shocking concentration of gases which are dissolved into the water could affect ...