Why we have units to measure Weight, Height, Force, Speed, Distance etc. But nothing to measure Love - Why?

A Sweet Story.
Once a girl askd a boy:
Why we hav units 2 measure Weight, Height, Force, Speed, Distance etc. But nothng 2 measure Luv, Trust, Frndship. Why?
Boy thought for a while, took her in arms,
looked in her deep eyes and said:
.
.

Dekh janu enj chawlan na mar main date tay aya wa physics da paper dain nai :-D