In the News/Activism forum, on a thread titled Worried About Floods Due to Rising Sea Level? Forget It: Not Happening, William Tell wrote:
mosesdapoet said: “There is no increase in the volume of liquid.”
Check your assumptions.
There is an old saying that “a pint’s a pound the world around”. This is describing that the volume of a pint, 16 ounces volume, is equal to 16 ounces of weight. This applies to water. A pint of mercury would weigh considerably more than a pound
We’re talking a liquid measurement in weight not the volume size of a pint glass.
"Liquid measurement" refers to volume. The added "in weight" makes your reference quite ambiguous.
To use your original example, if I start out with 5 ounces of LIQUID water and 5 ounces of ICE (non-liquid water), then I will most assuredly have MORE liquid after the melting than before. The additional amount will depend upon whether the "5 ounces of ice" refers to the volume of the ice or the weight of the ice.
Five ounces of water by volume is roughly the same as five ounces of water by weight. Five ounces of ice by volume, since water expands when freezing, is less than five ounces of ice by weight because ice is less dense than water.
When you say, "There is no increase in the volume of liquid", you are referring to the indicated level of the liquid in the 12 ounce glass. This indicated level IS NOT the volume of the liquid. It is the volume of the liquid plus the water displaced by the weight of the ice.