Aquarium guide
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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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ЦИКОРИЙ , род травянистых растений семейства сложноцветных. Около 10 видов, в Евразии и Сев. Африке; в России, в Европейской части и в Сибири, на лугах, полянах, часто как сорное растение у дорог. Цикорий обыкновенный возделывают ради корней (добавка к натуральному кофе, отвар - лекарственное средство; листья пригодны для салата; медонос). Цикорий эндивий - салатное растение, культивируемое главным образом в странах Средиземноморья.