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Parts per Million by Weight in Water The concentration to ppm gas present in water is usually expressed using weight. To quantify this concentration in metric units, it is necessary to calculate the density of the water. It is necessary. The density of water that is pure must be 1000.0000 kgs/m 3. at temperatures of 3.98degC and an average atmospheric pressure up to 1969. This was the initial definition for the kilogram. The most current definition of the Kilo is that it is the equivalent to an kilogram according to the international model. Water of an ultra clean (VSMOW) that is heated to 4 degrees Celsius (IPTS-68) in typical atmospheric pressure can be described as a quantity that is 999.9750 kg/m 3. . [5] The density of water can be affected by temperature, pressure or impurities i.e. gases that dissolve and saltiness of water. The huge concentration of gases that dissolve in water could affect the density of the water. There is a possibility that water has a specif...