Mass
mass
A [proper] fraction.
Yes.
It is a proper fraction.
You may be reaching for "fraction".
That is the specific gravity of the substance.
A balanced scale, which compares the mass of one object with that of a known quantity.
A percent is a ratio, or rate, that compares a number to100
A ratio that compares the first number of two ratios Ex: 3/10 and 4/10 3/4 would be the part to part ratio
A balanced scale, which compares the mass of one object with that of another.
A Part-to-part ratio
The chimney.