None.
An erg is a measure of energy while a gram weight is a measure of force. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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100 centigrams = 1 gram
1 drop = 1 gram
1 gram = 0.01 hg.1 gram = 0.01 hg.1 gram = 0.01 hg.1 gram = 0.01 hg.
1 gram. there are 1000mg in a gram
10 decigrams in 1 gram