Mass divided by Volume
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Density
Answer: Both fluorescence and phosphorescence are based on the ability of a substance to absorb light and emit light of a longer wavelength and therefore lower energy. The main difference is the time in which it takes to do so. So if it disappears immediately, it's fluorescence. If it lingers, it's phosphorescence.
Explanation:
By the following statement above, milk is an example of : c. colloid
Milk is an emulsified colloid of liquid butterfat globules dispersed within a water-based solution.
colloid is ultra microscopic particles of one substance dispersed through a second substance.
hope this help
Answer :-
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Water and Air are necessary for rusting .</h3>