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“You wanna fly, you got to give up the shit that weighs you down.” - Toni Morrison
Ounces to grmas
It's confusing in US to know what is an oz and what is an fl oz. The first one (oz) is telling you how big your steak is! The second one (floz) is telling you how much beer there is in your bottle! US is using ounces instead of grams and liquid ounces instead of milliliters! Easy and clear... if you are born in US :]


THE HISTORY OF THE OUNCES
Ounce derives from latin and the Ancient Roman times uncia. A unit of weight. The ounce is meaning “twelfth part”, which was 1/12 of a Roman foot or ounce. The standard or physical embodiment of the Roman foot, a copper bar, constituted the Roman pound standard and was divided along its length into 12 equal parts, called unciae.


THE HISTORY OF THE GRAMS
The gram. In 1795, the French National Convention replaced the gravet with the gramme in the metric system. As the weight of a volume of water equal to the cube of the hundredth part of a a metre. In the late 19th century, a base unit, the kilogram, was needed. The kilogram and its derivative unit was the gram. In 1960, the new International System of Units defined the gram as one thousandth of a kilogram.