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The magnitude of a distributed force, as pressure, stress, weight, etc., per unit of surface, or of volume, as the case may be; as, the measure of the intensity of a total stress of forty pounds which is distributed uniformly over a surface of four square inches area is ten pounds per square inch.

Included between two plane surfaces or faces; as, an interfacial angle.

opposed to exterior, or superficial; as, the interior apartments of a house; the interior surface of a hollow ball.

Inward; interior; being within any limit or surface; inclosed; -- opposed to external; as, the internal parts of a body, or of the earth.

Inwardly; within the enveloping surface, or the boundary of a thing; within the body; beneath the surface.

The point or line in which one line or surface cuts another.

Expressing penetration beyond the outside or surface, or access to the inside, or contents; as, to look into a letter or book; to look into an apartment.

nt O on the line, that the product Oa.Oa' = Ob.Ob' = Oc.Oc' is constant. Sets of lines or surfaces possessing corresponding properties may be in involution.

. Iron usually appears dark brown, from oxidation or impurity, but when pure, or an fresh surface, is a gray or white metal. It is easily oxidized (rusted) by moisture, and is attacked by many corrosive agents. Symbol Fe (Latin Ferrum). Atomic weight 55.9. Specific gravity, pure iron, 7.86; cast iron, 7.1. In magnetic…

A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line. [Written also isobare.]

A line connecting the points on the surface of the earth where a certain temperature is found at the same depth.

A line connecting places on the earth's surface at which there is the same mean frequency of auroras.

r dip; having equal inclination or dip. Isoclinal lines (Magnetism), lines on the earth's surface connecting places at which a dipping needle indicates the same inclination or dip.

A line connecting points on the earth's surface having the same mean temperature in the coldest month of the year.

produce a similar amount of heat. -- Isodynamic lines (Magnetism), lines on the earth's surface connecting places at which the magnetic intensity is the same.

A line or curved surface passing beneath the earth's surface through points having the same mean temperature.

rtaining to, having the nature of, or marking, isogeotherms; as, an isogeothermal line or surface; as isogeothermal chart. -- n.

Pertaining to, or noting, equal angles. Isogonic lines (Magnetism), lines traced on the surface of the globe, or upon a chart, connecting places at which the deviation of the magnetic needle from the meridian or true north is the same.

Of or pertaining to lines connecting places on the earth's surface which have a mean annual rainfall. -- n.

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