Parts per Million by Weight in Water The concentration in ppm for gas in water is typically expressed in pounds. To determine this concentration using metric units, it is necessary to determine the density in water. should be determined. The density of pure water is by definition 1000.0000 kg/m 3. at a temperature of 3.98degC and the typical atmospheric pressure that was in use since 1969. This was then the norm for the kilogram. The kilo today can be defined as equivalent to the mass which is the basis that is used for the kilogram. The water of the greatest purity (VSMOW) in temperatures of 4degC (IPTS-68) and normal atmospheric pressure is expected to have an average density within about 999.9750 kg/m 3. . [5] Water's density can be affected by pressure, temperature and the presence of impurities i.e. gasses that dissolve in water, as well as its saltiness. Additionally, the high concentration of the gases that dissolve in water will influence its density. It is
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