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  1. For a highway, the density of traffic when the volume equals the capacity. 2. The density of a substance at the liquid-vapor critical point.


Related Terms

DENSITY

The mass per unit volume of a substance at specified conditions of temperature and pressure.

COEFFICIENT OF COMPRESSIBILITY

The decrease in volume per unit volume of a substance ment drives, especially while running.cm See centimeter.cmHg See centimeter of mercury.

BULK MODULUS OF ELASTICITY

The ratio of the compressive or tensile force applied to a substance per unit surface area to the change in volume of the substance per unit volume. Also known as bulk modulus; compression modulus; hydrostatic modulus; modulus of compression; modulus of volume elasticity.

INCOMPRESSIBILITY

Quality of a substance which maintains its original volume under increased pressure.

ARCOMETER

A device for determining the density of a liquid by measuring the apparent weight loss of a solid of known mass and volume when it is immersed in the liquid.

SPECIFIC VOLUME

The volume of a substance per unit mass; the reciprocal of density.

DISPLACEMENT AS A WEIGHT

() This is the weight of water displaced by the ship and equals the volume displaced multiplied by a constant representing the density of water, i.e

BULKING VALUE

The relative ability of a pigment or other substance to increase the volume of paint.

AIR

A substance containing by volume approximately 78 - 79% nitrogen; 20.95% oxygen, 0.94% argon, traces of carbon dioxide, helium, etc.

PIEZOMETER

  1. An instrument for measuring fluid pressure, such as a gage attached to a pipe containing a gas or liquid. 2. An instrument for measuring the compressibility of materials, such as a vessel that determines the change in volume of a substance in response to hydrostatic pressure.

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