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es or curves exhibiting, on a diagram of energy, the law of variation of the pressure and density of a fluid, the one during the lowering, and the other during the raising, of its temperature, when the quantity of heat given out by the fluid during any given stage of the one process is equal to the quantity received du…

Having equal density, as different regions of a medium; passing through points at which the density is equal; as, an isopycnic line or surface.

stand higher than the ocean beds chiefly because the material of the crust has there less density.

equal to the weight of a cubic decimeter of distilled water at the temperature of maximum density, or 39º Fahrenheit.

A form of hydrometer, specially graduated, for finding the density of milk, and thus discovering whether it has been mixed with water or some of the cream has been removed.

The science of the determination of the density of vapors and gases.

Abnormal hardness and density of bone.

The quality or state of being porous; -- opposed to density.

ature of 60º Fahrenheit being of specific gravity 0.7939 referred to water at its maximum density as unity. Proof spirit has at 60º Fahrenheit a specific gravity of 0.93353, 100 parts by volume of the same consisting of 50 parts of absolute alcohol and 53.71 parts of water," the apparent excess of water being due to co…

e quality or state of being rare; rareness; thinness; as, the rarity (contrasted with the density) of gases.

rays of light orr heat, when passing from one transparent medium to another of different density; to cause to deviate from a direct course by an action distinct from reflection; as, a dense medium refrcts the rays of light as they pass into it from a rare medium.

tion of ray of light, heat, or the like, when it enters obliquely a medium of a different density from that through which it has previously moved. Refraction out of the rarer medium into the denser, is made towards the perpendicular. Sir I. Newton.

The state or quality of being solid; density; consistency, -- opposed to fluidity; compactness; fullness of matter, -- opposed to openness or hollowness; strength; soundness, -- opposed to weakness or instability; the primary quality or affection of matter by which its particles exclude or resist all others; hardness;…

the amount of red cuprous oxide thrown down. -- Heavy solution (Min.), a liquid of high density, as a solution of mercuric iodide in potassium iodide (called the Sonstadt or Thoulet solution) having a maximum specific gravity of 3.2, or of borotungstate of cadium (Klein solution, specific gravity 3.6), and the like.…

a distillery. Still watcher, a device for indicating the progress of distillation by the density of the liquid given over. Knight.

ous physical units are usually based on given units of length, mass, and time, and on the density or other properties of some substance, for example, water. See Dyne, Erg, Farad, Ohm, Poundal, etc. -- Unit deme (Biol.), a unit of the inferior order or orders of individuality. -- Unit jar (Elec.), a small, insulated L…

equired degree. -- Vapor burner, a burner for burning a vaporized hydrocarbon. -- Vapor density (Chem.), the relative weight of gases and vapors as compared with some specific standard, usually hydrogen, but sometimes air. The vapor density of gases and vaporizable substances as compared with hydrogen, when multiplie…

An instrument for determining the strength or purity of wine by measuring its density.

d of mercury, for ascertaining the precise temperature at which water attains its maximum density. This is about 39º Fahr., or 4º Centigrade; and from that point down to 32º Fahr., or 0º Centigrade, or the freezing point, it expands.