Physical properties are properties of an element or compound that can be observed without a chemical reaction of the substance. Density and electrical conductivity are examples of physical properties.

In a physical change, the substances are not altered chemically. No new products are formed. Chemical bonds are not broken in a physical change

A physical change can affect the size, shape or color of a substance but does not affect its composition. The substances may be changed to another phase (i.e. gas, liquid, solid) or separated or combined.

Examples:

when ice melts
when sulfur is mixed with iron filings.
breaking a glass
dissolving sugar in water

See Also:

What is a Chemical Change

Assessment Quiz-- Physical and Chemical Change