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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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15y ago

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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


Therefore: 1 fluid ounce is a measure of volumn: There are 8 ounces in one cup of liquid. 1 ounce is a measure of weight: There are 16 ounces in 1 pound.
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15y ago
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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.

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13y ago
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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.

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15y ago
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Ounces measure weight or mass while fluid ounces measure volume or capacity.

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10y ago
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Fluid ounce is the measurement of volume[liquid].

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9y ago
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The difference is that 1 fl oz (fluid ounce) is a measure of volume whereas 1 oz (ounce) is a measure of weight.

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14y ago
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  • fluid ounces are a liquid unit of volume
  • ounces are a unit of weight
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10y ago
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No, a fluid ounce is approximately 1.2 grams heavier.

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10y ago
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2.7 fl oz

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12y ago
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Q: What is the difference between a dry ounce and a liquid ounce?
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