What are examples of the common physical changes?

Physical changes refer to changes that a substance undergoes only in its physical properties without undergoing any change to its molecular composition. These changes are generally temporary and reversible. 

Examples of common physical changes include but are not limited to: 

• Change in shape – The shape of an object can be changed without any change to its chemical composition. One such example is folding a sheet. Regardless of whether you fold the sheet in a square, triangular, or rectangular shape, the sheet will remain the same chemically. Only its physical shape changes.
• Change in size – An object can be cut in half or expanded while leaving its molecular composition unchanged. Tearing a sheet of paper into small pieces is a classic example. No matter how small the piece of paper, its chemical composition will remain the same. 
• Change in texture – Changing the texture of a substance only changes its appearance without changing its molecular structure. For example, you can change the texture of a rough piece of wood by sanding, polishing, and waxing it but underneath the altered texture and appearance, it’s still a piece of wood. At its core, it hasn’t changed.
• Change in state – At any given time, an object will exist in any one of three states – solid, liquid, or gaseous. Regardless of its change of state however, the chemical composition of the original substance will remain the same. A classic example is that of water turning from a viscous liquid to solid ice or gaseous vapor. In all three states, the chemical composition of water is still H2O.