Ohm

(dm) [Dr. G. S. Ohm, a German physicist]. The unit of electric resistance. The ohm adopted as a standard varies; the British A ociation O. is the resistance of a column of mercury I square millimeter in section and 1. 0493 1 8 meters long. The legal O. is similar to the B. A. O., except that the column of mercury is 1. 06 meters in length. The international O. adopted 1893, is the resistance of a column of mercury 1.063 cen” timeters long and weighing 14.4521 grams. 455