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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}} .
The densitometer is basically a light source aimed at a photoelectric cell. [2] It determines the density of a sample placed between the light source and the photoelectric cell from differences in the readings. [3] Modern densitometers have the same components, but also have electronic integrated circuitry for better reading. [4]
The corresponding measuring device is called a densitometer (absorptiometer). The decadic (base-10) logarithm of the reciprocal of the transmittance is called the absorbance or density. [1] DMax and DMin refer to the maximum and minimum density that can be produced by the material. The difference between the two is the density range. [1]
A density gauge being used to ensure proper compaction for the foundation of a school construction project. Nuclear densitometry is a technique used in civil construction and the petroleum industry , as well as for mining and archaeology purposes, to measure the density and inner structure of the test material.
The number density (symbol: n or ρ N) is an intensive quantity used to describe the degree of concentration of countable objects (particles, molecules, phonons, cells, galaxies, etc.) in physical space: three-dimensional volumetric number density, two-dimensional areal number density, or one-dimensional linear number density.
(meters) + 0.016 × Age (yrs., take as 25 for 18-25) − 2.003 These estimates are for adults aged 18-70, have standard deviation of about 0.4 litres and have dependence on ethnicity, environmental factors, etc. [ 4 ] Residual volume may also be estimated as a proportion of vital capacity (0.24 for men and 0.28 for women).
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.
The granularity measurement [2] involves the use of an optical aperture, 10-50 micrometers in diameter, and in the recording of thousands of optical density readings. The standard deviation of this series of measurements is known as the granularity [2] [3] of the measured transmission surface, optical film, or photographic film, in particular .