Secretive and wary, weasels are difficult to study in. nature, and many gaps remain in our knowledge of their. reproduction. Two of the species covered in this Wild-. life Note (the ermine and the long-tailed weasel) exhibit.
Extensive - Properties that do depend on the amount of matter present. Mass - A measurement of the amount of matter in a object (grams). Weight - A measurement of the gravitational force of attraction of the earth acting on an object. Volume - A measurement of the amount of space a substance occupies. Length.
The density of a given substance is constant, given constant conditions, regardless of the amount. Mass, on the other hand, is dependent on amount, as it is meaningless to try to define the mass of a substance without defining its volume and its environmental conditions. Mass and density vary greatly between various elements and their compounds.