Parts per Million by Weight in Water The concentration at ppm of gas in water is typically measured in terms of weight. To measure this concentration by metric units, the density of water must be measured. The density of water that is pure is by definition 1000.0000 kg/m 3. at a temperature of 3.98degC and the standard atmospheric pressure which was in use until 1969. In 1969, this was the normative definition of the kilogram. Nowadays, the kilo is described as equivalent to the mass, which is the basis on the planet of the kilogram. Water of high purity (VSMOW) is heated up to 4° Celsius (IPTS-68) and normal atmospheric pressure is described by having an average density that is the range of 999.9750 kg/m 3. . [5] Water's density is affected by temperature, pressure as well as impurities i.e. gases that dissolve, and the saltiness of water. Furthermore, the high concentration of gases that dissolve in water can alter the density of water. In the course of things that ...
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