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This army of such mass and charge.

5. The principal part; the main
body.

Night closed upon the pursuit, and aided the
mass of the fugitives in their escape.

6. (Physics) The quantity of matter
which a body contains, irrespective of its bulk or volume.

&fist; Mass and weight are often used, in a general
way, as interchangeable terms, since the weight of a body is
proportional to its mass (under the same or equal gravitative
forces), and the mass is usually ascertained from the
weight. Yet the two ideas, mass and weight, are
quite distinct. Mass is the quantity of matter in a body;
weight is the comparative force with which it tends towards
the center of the earth. A mass of sugar and a mass of
lead are assumed to be equal when they show an equal weight by
balancing each other in the scales.

Blue mass. See under Blue. --
Mass center (Geom.), the center of
gravity of a triangle.


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