Parts per Million by Weight in Water The concentration of gas at ppm that is present in water is typically expressed as weight. To measure this concentration using metric units, that measure the water's density is needed. Pure water's density is by definition 1000.0000 kg/m 3. at a temperature of 3.98degC and the standard atmospheric pressure that was used up until 1969. In the past it was the standard of the kilogram. Today, the kilo can be described as being equal to the mass that is the most famous model of the kilogram. Water of high purity (VSMOW) with temperature of four degrees Celsius (IPTS-68) as well as regular atmospheric pressure is described by having an average density that is within the range of 999.9750 kg/m 3. . [5] The density of water is influenced by pressure, temperature, as well as the existence of contaminants i.e. gases that dissolve, and the saltiness of water. Furthermore, the high concentration of gases that dissolve in water can affect ...
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