1 square on vertical axis represents what

When a scientific theory has been tested and proved by the scientific community, it becomes a law

Ablock of aluminum is dropped into a graduated cylinder with an initial volume of water at 75ml and the volumes rises to 90ml. if the block has a mass of 40.5 g what is its density ?

What is the difference between a substance "getting wet" and "being dissolved" in a liquid at the particulate level?