Explain this statement clearly " To call a dimensional quantity ‘large’ or ‘small’ is meaningless without specifying a standard for comparison”

Explain this statement clearly:

“To call a dimensional quantity ‘large’ or ‘small’ is meaningless without specifying a standard for comparison”. In view of this, reframe the following statements wherever

necessary:

(a) atoms are very small objects

(b) a jet plane moves with great speed

(c) the mass of Jupiter is very large

(d) the air inside this room contains a large number of molecules

(e) a proton is much more massive than an electron

(f) the speed of sound is much smaller than the speed of light.

Answer:

The dimensional quantity depends on the unit (standard) of measurement. For example the distance between two points in a simple graph is measured in cm while distance between two cities is measured in kilometer

 (a) An atom is a very small object when we compare it with a cricket ball.

(b) A jet plane moves with a speed greater when we compare it with a motor bike.

(c) Mass of Jupiter is very large when we compare it with the mass of a coin.

(d) The air inside this room contains a large number of molecules when we compare it with the number of person present in our class.

(e) A proton is more massive than an electron. 

Mass of a protons is 1.67 × 10^-24 g while mass of electron 9.11 × 10^-28 g , hence statement is true

(f) Speed of sound is less than the speed of light. Speed of sound 346 m/ sec while speed of light is 3 x 10⁸m / sec in air at 25 ⁰C hence statement is true.