Hg


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Hg,

symbol for the element mercurymercury
or quicksilver
[from the Roman god Mercury], metallic chemical element; symbol Hg [Lat. hydrargyrum=liquid silver]; at. no. 80; at. wt. 200.59; m.p. −38.842°C;; b.p. 356.58°C;; sp. gr. 13.55 at 20°C;; valence +1 or +2.
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hg

(mechanics)
hectogram

Hg

(chemistry)
mercury

HG

(medicine)
A symbol used in electrocardiography for the longitudinal axis of the heart as projected on the frontal plane.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.