n. 等压线, 同重元素, 同重核

[化] 等压线; 同量异位素(质量数相同)

[医] 同量异位素, 等压线

[ noun ]
(meteorology)an isogram connecting points having equal barometric pressure at a given time
<noun.location>

Isobar \I"so*bar\, n. [Iso- + Gr. ? weight.] (Phys. Geog.)
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}.]