Chemistry
An emulsion is a colloid of a

Liquid in a liquid
Liquid in a gas
Gas in a solid
Gas in a liquid

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

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

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