Hydrometer
A hydrometer is a device used to measure the specific gravity (density) of a liquid in relation to water. In maritime context, hydrometers are commonly used to determine the salinity of seawater. This information is important for navigation, as the salinity affects the density of the water and therefore the buoyancy of ships. Hydrometers can also be used to measure the density of fuel and lubricating oils, which is important for ensuring the proper functioning of engines and machinery on board ships.
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