Density vs. Hardness

Densitynoun

(physics) A measure of the mass of matter contained by a unit volume.

Densitynoun

The ratio of one quantity to another quantity.

Densitynoun

The probability that an event will occur, as a function of some observed variable.

Densitynoun

The quality of being dense, close, or thick; compactness; - opposed to rarity.

Densitynoun

The ratio of mass, or quantity of matter, to bulk or volume, esp. as compared with the mass and volume of a portion of some substance used as a standard.

Densitynoun

Depth of shade.

Densitynoun

the amount per unit size

Densitynoun

the spatial property of being crowded together

Density

The density (more precisely, the volumetric mass density; also known as specific mass), of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used.

Hardnessnoun

The quality of being hard.

Hardnessnoun

An instance of this quality; hardship.

Hardnessnoun

(inorganic chemistry) The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).

Hardnessnoun

The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material.

Hardnessnoun

(physics) The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation.

Hardnessnoun

The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack.

Hardnessnoun

The quality or state of being hard, literally or figuratively.

Hardnessnoun

The cohesion of the particles on the surface of a body, determined by its capacity to scratch another, or be itself scratched; - measured among minerals on a scale of which diamond and talc form the extremes.

Hardnessnoun

The peculiar quality exhibited by water which has mineral salts dissolved in it. Such water forms an insoluble compound with soap, and is hence unfit for washing purposes.

Hardnessnoun

the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale

Hardnessnoun

devoid of passion or feeling

Hardnessnoun

the quality of being difficult to do;

Hardnessnoun

excessive sternness;

Hardness

Hardness is a measure of the resistance to localized plastic deformation induced by either mechanical indentation or abrasion. In general, different materials differ in their hardness; for example hard metals such as titanium and beryllium are harder than soft metals such as sodium and metallic tin, or wood and common plastics.