Gold: ACTIVE|Purple of cassius is delicate test for auric gold. ...gold, like other precious metals, is measured in troy weight; when alloyed with other metals, term karat is used to express amount of gold pres
ANNEX 1 1. The formula for the radio refractive index The atmospheric radio refractive index, n, can be computed by the following formula: n = 1 + N x lo4 where: N: radio refractivity expressed by: N = 77.6 T (P + 4810 +) P : atmospheric pr 4、essure (hPa)* e : T: ...