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Parts per Million by Weight in Water It's the concentration of gas at ppm present in water. This is usually expressed as weight. To calculate the concentration using metric units how much water is it. Water's density in pure form is 1000.0000 kilograms for every millimeter 3. at temperatures of 3.98degC and the standard atmospheric  pressure that was in place until 1969. This was the first classification of the kilogram. The current definition of the Kilo is that it is equal to the weight of the prototype to define the international kilogram. High-purity water (VSMOW) in temperatures up to 4°C (IPTS-68) in regular atmospheric  pressure has been measured found to have an average density of 999.9750 kg/m 3. . [5] The density of water can be affected by temperature, pressure, and impurities i.e. the dissolved gasses and saltiness of water. A shocking concentration  of the gases that is dissolved in the water could impact the density of the water. There is a pos...