At Stp, which physical property of aluminum always remains the same from sample to sample?

Density - The proportion of mass to volume of an object.

Density determines what floats and what sinks. More dense sinks less dense will float.

Answer;

-Density

Explanation;

-At Stp, density is the physical property of aluminium that always remains constant from sample to sample; this is because density is a proportion of mass to volume and will not change.

-The density of an object or quantity of matter is its mass divided by its volume. Thus, the mass of an atom and their volume determines their density.