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Parts per Million by Weight in Water It's the concentration of gas in ppm present in water . It's expressed in terms of weight. To quantify this concentration using metric units , an estimation of density in water is needed. The density of water that is pure has been calculated to be 1000.0000 kilograms per millimeter 3. at temperatures of 3.98degC and the normal atmospheric pressure in 1969. This was the prior measurement of the kilogram. The word "kilo" is now defined as equivalent to the mass of the prototype used in international usage for the kilogram. Water that is high-purity (VSMOW) in the case of temperatures that are 4degC (IPTS-68) and regular atmospheric pressure has at the average density 999.9750 kg/m 3. . [5] The density of water is influenced by pressure, temperature as well as impurities i.e. gasses that dissolve as well as the saltiness of the water. This alarming concentration of gases that dissolve in the water could affect the den
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