Final answer:
An example of an extensive physical property is mass because it depends on the amount of matter present.
Step-by-step explanation:
An example of an extensive physical property is mass. Extensive properties depend on the amount of matter present, and mass is a fundamental example of this type of property. A gallon of milk has a larger mass than a cup of milk, demonstrating the direct proportionality of mass to the quantity of matter. Conversely, properties like density, boiling point, and melting point are intensive properties because they do not change with the amount of substance present. Density remains the same regardless of whether you have a gram or a kilogram of a substance, and the boiling and melting points of a pure substance remain constant under the same conditions.