milk and air is a mixture justify
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> Air is a homogenous and colourless mixture consisting of gaseous nitrogen (N2
), oxygen (O2
), carbon dioxide (CO2
), argon (Ag) and some trace amounts of water vapour, methane (CH4
), ammonia (NH3
), etc. Air is considered as a mixture because of the following reasons:
> It is possible to separate air into its constituent gases by means of physical methods like fractional distillation. The boiling point of nitrogen (77.3 K) is less than that of oxygen (90 K). So, when liquefied air is distilled, nitrogen is separated out first and oxygen is left in the mixture. No energy or heat is either absorbed or evolved while mixing gases.
As we know that the pure substances are either elements or compounds while the mixture is a resultant product of any two or more than two substances.
Now as we know that we get milk from the cow and it is a mixture of water, fat and solids (in the form of milk protein and carbohydrates) which is mixed irrationally.
Therefore milk is a mixture not a pure substance.
Main compounds of milk are lactose and casein.
And it is also called a colloidal mixture (i.e. in which one substance of microscopically dispersed insoluble or soluble particles is suspended throughout another substance).
Therefore milk is regarded as a mixture not as a pure substance.