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1. Mass properties
By way of example, table 1 shows a hydraulic fluid data sheet (doc. ESSO) containing all the characteristics of the liquid lubricant in question for users.
1.1 Density
The density of a liquid at a given temperature is the mass per unit volume; it used to be called specific mass.
For petroleum products, it is measured at 15°C and expressed in kg/m 3 or kg /dm 3 or g /cm 3 .
Various methods are used to measure it:
direct hydrometer measurement using Archimedes' principle....
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Mass properties
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