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A density meter (densimeter) is a device which measures the density of an object or material. Density is usually abbreviated as either ρ {\displaystyle \rho } or D {\displaystyle D} . Typically, density either has the units of k g / m 3 {\displaystyle kg/m^{3}} or l b / f t 3 {\displaystyle lb/ft^{3}} .
U-tube with piezo-electric actuator Digital density measuring principle. The oscillating U-tube is a technique to determine the density of liquids and gases based on an electronic measurement of the frequency of oscillation, from which the density value is calculated. This measuring principle is based on the Mass-Spring Model.
Relative density is use in medicine particularly in pharmaceutical field. It is used in automated compounders in preparation of multicomponent mixtures for parenteral nutrition, while it is an important factor in urinalysis, relative density is an indicator of both the concentration of particles in the urine and a patient's degree of hydration. [9]
Dredging industries use gravitic density meters to measure the amount of debris being moved and carried by the dredge. Wastewater industries use gravitic density meters to measure the amount of sewage that needs to be treated. Paper production uses gravitic density meters to measure the amount of pulp currently being used in the process.
Measuring instruments in fiction: Captain Nemo and Professor Aronnax contemplating thermometers, barometers, clocks, etc. in Jules Verne's 1869-1870 science fiction novel Twenty Thousand Leagues Under the Seas Fun measuring instruments: a Love Meter and strength tester machine at a Framingham, Massachusetts rest stop.
This in-line section of pipe calculates the percentage of dry solids, wet density or wet and dry mass flow units. When coupled with compatible volumetric flow meters and processing units, this system gives a true value for density and mass flow. [2] The DM3 is a bi-directional unit which allows media to flow continuously through either ends.
The hydrometer sinks deeper in low-density liquids such as kerosene, gasoline, and alcohol, and less deep in high-density liquids such as brine, milk, and acids. It is usual for hydrometers to be used with dense liquids to have the mark 1.000 (for water) near the top of the stem, and those for use with lighter liquids to have 1.000 near the bottom.
Measuring combination of an automatic refractometer and a density meter as widely used in the flavors and fragrances industry Today's laboratories do not only want to measure the refractive index of samples, but several additional parameters like density or viscosity to perform efficient quality control.