Question

Which statement best describes what the mass of an object represents? Mass is the length of an object. Mass is the amount of matter in an object. Mass is the amount of space taken up by an object. Mass is the ability of an object to float.

Answer 1

The correct statement about the mass is: Mass is the amount of matter in an object. 
Here are the corrected mistakes in the rest of options to remember:
Buoyancy is the ability of an object to float
Volume is the amount of space taken up by an object.

Answer 2

Answer:

Mass is the amount of matter in an object.

Explanation:

Mass of object is defined as the amount of matter contained inside an object.                            It remains same at every location in the universe. It can be measured using balance. The relation between mass and weight is given by :

W = m g

g is the acceleration due to gravity, g = 9.8 m/s²

And W is the weight of object and m is its mass

The weight of an object is due to the force of gravity on an object. It varies with respect to location.

Hence, the correct option is " Mass is the amount of matter in an object ".