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<h2> <strong><a href="https://aboneapp.com/#/partsPer-converter">Parts per Million</a> by Weight in Water</strong> </h2> <p> <br> The concentration to ppm gas within water is typically expressed in terms of weight. To quantify this concentration by metric units, an estimate of the density of water is required. <br> The density of water that is pure is 1000.0000 kgs/square millimeter <sup>3</sup> at an average temperature of 3.98degC with at a constant <a href="https://en.wikipedia.org/wiki/Atmosphere_of_Earth">atmospheric</a>pressure which was in force until 1969. This was the previous designation for the kilogram. The term "kilo" is now defined as the equivalent from a global scale model for the kilogram. Water that is high-purity (VSMOW) in temperatures of 4 degrees Celsius (IPTS-68) as well as typical <a href="https://en.wikipedia.org/wiki/Atmosphere">atm...
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