Question

What are some practical applications of freezing point depression, boiling point elevation, and vapor press?

Answer 1

Have you never seen the roads salted in winter?

Explanation:

See this old answer. And this is a clear exploitation of the melting point depression phenomenon.

And at a more practical level for chemists, boiling point elevation, and freezing point depression phenomena can be used to assess the molecularity of a solute, and sometimes an accurate molecular mass.

And as another example, consider ice-cream. Chemists usually use liquid-nitrogen to make ice-cream. You COULD use water-ice doused with common salt to depress the melting point of water LOWER than `0` `""^@C` while you churn the ice-cream....