No one knows cause all the cup sizes are different?
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The causes may be: lack of globally standardization, ambition of glassware manufacturers to be different, often nationalism, lack of scientific knowledge, etc.
A formidable confusion is produced by all the Middle Age British units, today accepted in United States which doesn't recognize the SI.
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one half of a cup
4 cups of rice = 6 cups of water / divide both sides by 4 1 cup of rice = 1.5 cups of water
One fluid ounce is.
one twelth
16 times