The amount of matter in an object is known as mass. In physics, the term mass refers to the quantity of matter which a body contains regardless of its volume. While the basic SI unit for measuring is kg, there are instances where gram (g) is used, most especially for smaller objects.
There are different methods you can use to determine the mass of an object. However, regardless of any method you choose to use, you would need a balance, either electronic or beam balance. At times, mass and weight are confused for each other, but they are not the same even though they are closely related.
While mass measures the quantity of matter an object or substance contains, the weight of an object is the force of gravity acting on it. However, the force of gravity acting on an object also depends on the mass of the object.