Parts per Million by Weight in Water It is the concentration of gases at ppm that is found in water is usually expressed by weight. To determine this concentration in metric units, it is essential to measure the density of water. It is necessary. The density of pure water should be 1000.0000 kg/m 3. at a temperature of 3.98degC and the standard atmospheric pressure that was in effect up to 1969. It was the standard of the kilogram. The kilo is now defined as being equal to the mass, which is the basis of the kilogram. High purity water (VSMOW) that has temperatures as high as 4 degrees Celsius (IPTS-68) as well as regular atmospheric pressure is an average density of 999.9750 kilograms/m 3. . [5] The density of water is affected by pressure, temperature and impurities i.e. gases that dissolve, as well as the saltiness of water. Furthermore, the high concentration of gasses that dissolve in water alters the density of water. This is the reason behind water having an exac...
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