Mass is used for scientists/ chemists. They are trying to find the mass of the smallest things like atoms, molecules, and other elementary particles. Capacity is used in public places like gymnasiums or buses.
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Weight is used every morning, when I get on the scale.Mass is used mainly on Sunday mornings.
Proportions are used in real life to determine prices of things.
Believe it or not, school is a real life situation. If you are using it in school it real life for you.
If you are in school and are studying trig then you are using trig in real life.
Yes, they are used.