SG, specific gravity is a ratio of density compared to pure water. Seawater has a density of around 1025 kg/m^3 and pure water is around 1000kg/m^3 and therefore the seawater has a SG of 1.025. Density changes with temperature but since it's a ratio of two densities it has little effect.
SG seems to be the standard and it may make more sense to use salinity but it also makes more sense to use mm over inches since it would be more accurate but people are just more familiar with inches, for example my tank is 914 x 914 x 610 mm
07-04-2008, 07:21 PM
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