Will 2 objects that are the same size always have the same mass? use an example to explain

The objects will not always have the same mass because they might not be made of the same substance. Some substances are heavier or denser than others. For example; A plate made of clay will be lighter than one made out of gold or diamond. Also, if you fill a beaker with water and another with sand at the same level, you will notice that the beaker with sand will be heavier and weigh a lot more than the beaker with water. This is because sand is denser than water. Hope i helped. GOODLUCK.