Hydrometers Equipments is used for measuring a value of water in a compound. The hydrometer measures in particular the density of the fluids, mainly water, the gravity and the pressure of the liquids. The hydrometer measures a hydrometry, gives a hydrometric value and can take more specialized names such as rain gauge, hygrometer, hydrometer, lactometer according to its functionality. The term is generic without additional precision.
A hydrometer and a Digital Laboratory Scales specialized in the measurement of salinity: A hydrometer uses the principle of Archimedes for the measurement of the specific gravity, its relative density, of a liquid as being the ratio of the density of the liquid relative to the density of the water. It exists in the pre-calibrated state to measure the salinity of salt water. The hydrometer simplest (left in photo) measuring just a relative density, regardless of the temperature of the fluid, usually water for the most common applications. In aquariums Marine, the hydrometer must hold the temperature and the simplest instruments are calibrated for use in a range of very low temperatures.
Other devices like are more accurate because they take into account temperatures: they are thermo hydrometers. These are popularly called densimeters even though, again, the term is quite generic. In marine aquariums, measurements of salinities can also be made with other instruments: aerometer, hydrometer, Stoppers Items, refractometer, salinometer. A thermohydrometre is a hydrometer that has a thermometer enclosed in the floating section. To measure the density of liquids, the sample is usually heated in a temperature envelope with a thermometer placed behind it, because the density depends on the temperature. The thermo hydrometer provides a 2 in 1 solution to this relational problem between pressure and temperature.
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