Aquarium guide
Aquarium guide     

  
 
DENSITY
 

DENSITY

In marine aquariums, it is not the salinity of water which is measured, but the density (often expressed as specific gravity, S.G.), which can be calculated according to the following formula:

There are no units of measurements. The saltier the water, the higher its density. The density also varies according to temperature (it goes down as the temperature goes up). The table overleaf shows the relationship between salinity and density with respect to temperature, which is relatively constant (25-26°C) in aquariums. The density, expressed as specific gravity, a value which is easy to use, is all that is required to calculate salinity: it must range between 1.022 and 1.024.


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ПОРЧИНСКИЙ Иосиф Алоизиевич (1848-1916) , российский энтомолог, один из создателей сельскохозяйственной и медицинской энтомологии в России. Труды по биологии насекомых-вредителей сельскохозяйственных культур и паразитических насекомых-переносчиков возбудителей инфекционных болезней. Описал 130 новых видов насекомых.