Pat wrote:

<<If one ounce = 30 ml = 30 grams, isn't it all the same? 
My non math mind would appreciate knowing.  Pat in SNJ>>


Pat and everyone, 

The one ounce=30ml=30 grams is true for pure water. (Well, mostly true anyway. The measures are very, very close, but not exact.) The ounces are both fluid ounces and US customary weight/avoirdupois ounces. 16 ounces are not just a pint of water, it's also a pound of water.

Fluid ounces and milliliters are both measures of volume. Grams measure mass. Whether a substance follows the 1 ounce=30ml-30gr rule depends on the the specific gravity of the substance: if it has the same speific gravity as water then it measures both in volume and in mass the same as water. If its specific gravity differs from water, then 1 ounce by volume will not measure 1 ounce by weight. Volume is independent of mass: one cubic centimeter (or mL) of hydrogen has the same volume as one cc of lead even though the cubic centimeter of lead has a much greater mass than the hydrogen.


Hope this makes sense.

Warmly,
Carol Kelley
Taylors, SC



 



 


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