Why is milk white?
[ 2006-03-10 08:47 ]
Those chalky-white
mustaches that color our lips after chugging  down a refreshing ice-cold glass of
creamy milk is caused by the protein called Casein.
Rich in calcium, Casein helps contribute to milk's
white color.
In addition, the cream that is found in milk contains white
colored fat. The more cream in milk the more white it is.
Low and non-fat milk appear more grayish rather than
white because they contain less cream.
Another reason milk looks white to our naked eyes is
because some objects do not absorb very much light. Rather
than absorb light, these objects reflect light. For instance,
red colored objects reflect only red light and absorb the
other colors of light in the rainbow spectrum. The
molecules that make up Casein and cream reflect light.
That's why milk is white.
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mustaches: 胡子
Casein: 干酪素
calcium: 鈣
non-fat milk: 脫脂牛奶
spectrum:
光譜
molecules: 分子
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