Some balances can be marked in weight units, but since the weights are calibrated at the factory for standard gravity, the balance will measure standard weight, i . e . what the object would weigh at standard gravity, not the actual local force of gravity on the object.
12.
One method for doing this consists in weighing old coins; another uses the fact that Roman weight units were derived from Roman units of length similarly to the way the kilogramme was originally derived from the metre, i . e . by weighing a known volume of water.
13.
For example, while AUG?( the trademarked designation for e-gold ) was denominated in grams and decimal fractions ( or in troy ounces since, as weight units, both are related by fixed arithmetic ratio ), a Spend Instruction might be specified as Pay [ recipient account ] 10 USD worth of e-gold .
