[Stoat]

Oops - I think that the conversion chart (grams to ounces) is dealing with weight ounces, not the liquid measure of ounces. As in, 16 ounces to the pound, rather than 8 ounces to the cup.

 

Yes, you're right! My bad...I missed lunch today ;-)

Here's a fluid ounces to grams calculator:

 

Convert US fluid ounce to gram - Conversion of Measurement Units

 

It makes a difference....dry ounce conversion is shown in the chart as 8 ounces equalling approx. 226.8 grams whereas the fluid ounces calculator gives us 236.5882375 grams for eight fluid ounces.

Thanks for catching my error :-)

[meyer]

You also have to consider the density of the liquid in question. For example, a liquid ounce of water weighs considerably less than a liquid ounce of, say, mercury. Most oils are a bit less dense than water and therefore weigh less per unit volume than water, while other liquids like nitric acid and vinigar weigh more than water for the same volume measurement.