Chemistry
Milk is a colloidal system in which:

Fat and water are dispersed in each other
Fat is dispersed in water
Fat is dissolved
Water is dispersed in fat

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Chemistry
Photo chemical smog is a resultant of the reaction among

NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight
High concentration of NO2, O3, and CO in the evening
CO, O2 and peroxy acetyl nitrate in the presence of Sunlight
CO, CO2 and NO2at low temperature

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