In the English and US systems, there is some ambiguity and confusion with regard to the ounce because the same word 'ounce' is used for both weight and volume.
One ounce (mass or weight) is equal to 28.35 grams.
One fluid ounce is equal to about 29.57 cubic centimeters or milliliters.
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From the conversion factor: 1 US fluid ounce = 29.5735297 milliliters, (abbreviated as fl. oz) implies that it is used as a unit of VOLUME for both Imperial and US systems of units.
While an ounce (abbreviated as oz) as implied by the below conversion factor is a unit of MASS.
1 ounce = 28.3495231 grams
A Troy ounce is 1/12th of a pound weight, used now to gauge the weight of precious metals and is equal to 480 grains.
An ordinary ounce is 1/16th of a pound weight for general measurement and is equal to 437.5 grains.
A troy ounce is equal to 31.103 grams and there are 12 of them in a troy pound.
An ounce is equal to 28.349 grams and there are 16 of them in a pound.
Just to keep everyone confused, the word "ounce" is used for both a unit of weight/force
and a unit of volume/capacity.
16 ounces of force is equal to one pound of force, and 32 ounces of volume is equal to one quart. OK ?
In an attempt to clarify the situation when the physical dimension is not obvious from the context,
the unit is often referred to as a "fluid ounce" when it means volume.
The difference is that 1 fl oz (fluid ounce) is a measure of volume whereas 1 oz (ounce) is a measure of weight.