Types of colloids

• Liquid in gas -> Aerosol

  Ex: fog , mist
• Solid in gas -> Aerosol

  Ex: smoke , automobile exhaust
• Gas in liquid -> foam

  Ex: Shaving cream
• Liquid in liquid -> emulsion

  Ex: Milk, face cream
• Solid in liquid-> Sol

  Ex: milk of magnesia, mud
• Gas in solid -> Foam

  Ex: Foam , sponge
• Liquid in solid -> Gel

  Ex: jelly , cheese , butter
• Solid in solid- solid sol

  Ex: coloured gemstone , milky glass