Chemistry
Milk is a colloidal system in which:

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

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Chemistry
Sodium vapour lamps glow with yellow colour. This is due to

sublimation of sodium to emit yellow colour
The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum
The low ionisation energy of sodium
Its ability to absorb all other colours except yellow

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