![]() For some reason it become adopted as a standard volume measure, probably due to its size and standardization. Regardless, all fluid ounces are now defined as having a particular volume, with no necessary relationship to the density or weight of the material.ĭespite the confusion it causes, the name stuck. chose the old British wine measure as the standard size for its ounce. Britain chose water as its standard the U.S. and Britain decided to standardize the "fluid ounce" as a volume measurement equivalent in all contexts, regardless of the substance. An "ounce" would thus be a different size depending on the substance being measured. To answer the question about why we use a "fluid ounce" rather than other volume measurements, originally the "fluid ounce" referred to a volume of a specific fluid that weighed an ounce, usually wine, ale, or water. Professional cookbooks for large quantities sometimes have recipes which are entirely given in weight measurements again, in the case context should make that clear.Recipes for baking sometimes also include weight measurements in addition to volume measurements (e.g., cups) in this case it is generally clear that an "ounce" refers to weight measurement.For dry goods, usually an "ounce" refers to weight, not volume.An "ounce" of anything liquid or roughly fluid (gravy, sauce, syrup) should usually be measured in a measuring cup by volume (regardless of weight).Unless the recipe or source specifies, I would generally assume: In a recipe, the word "ounce" is ambiguous. The fact that these units have a similar name is due to historical accident, and you'd be better served by not thinking of them as related AT ALL. The exact sizes of these measurements vary by country and by historical period, as can be seen at the links. An ounce is a measure of mass or weight.Being able to convert between units of measurement in SI, the US customary system, and the imperial system can be useful. Within the same system of measurement, gallons, quarts, pints, and cups, etc., share the same relationship, but since the US and imperial systems have different definitions of the gallon, their actual volumes differ. Below are some of the relationships between US customary, imperial, and SI (International System of Units) measurements of volume. As a result, they both use many of the same units, such as fluid ounces, gallons, quarts, pints, cups, and gills, but these units have different measures depending on the system of measurement. The US customary and imperial systems of measurement are closely related. The US fluid ounce is defined relative to the US gallon, while the imperial fluid ounce is defined relative to the imperial gallon. It is worth noting that when the meaning is clear, sometimes, "ounce" is used to refer to "fluid ounce." For example, a 20 oz coffee refers to its volume rather than to the weight of the coffee. In most cases today, 1 fluid ounce of some substance will not weigh 1 oz, though 1 imperial fluid ounce of water does weigh close to 1 avoirdupois ounce. In the past, fluid ounces were defined based on the volume occupied by one ounce of some substance (water, wine etc.), which was dependent on the system of fluid measure being used. Many other definitions of the fluid ounce were used in the past, but these are the two definitions that are still in common use.įluid ounces should not be confused with ounces, a measurement of weight and mass. The fluid ounce has different definitions in the US customary and imperial systems of measurement. As its name suggests, fluid ounces are mostly used to measure liquids, such as the amount of liquid in a container, like a drink or a cup of coffee. customary and imperial systems of measurement. Home / primary math / volume / fluid ounce Fluid ounceĪ fluid ounce ( fl oz) is a unit of volume in the U.S.
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