Parts per Million by Weight in Water The concentration at ppm of gas in water is generally expressed as weight. To quantify this concentration in metric units, it is necessary to determine the density. is required. In pure waters, the density will be 1000.0000 kg/m 3. at a temperature of 3.98degC and the standard atmospheric pressure that was in use up to 1969. In the past it was the standard for the kilogram. The kilo today can be described as being equal to the mass , which is the prototype for the kilogram. Water of high purity (VSMOW) at temperatures of 4 degrees Celsius (IPTS-68) and normal atmospheric pressure could be defined as having an average densities that is within the range of 999.9750 kg/m 3. . [5] The density of water is influenced by pressure, temperature and the presence of impurities i.e. gasses that dissolve, and the saltiness of water. Furthermore, the high concentration of gases that are dissolved in water alters its density. This is due to the fact ...
Comments
Post a Comment