This depends on your needs !
For example the melting point.
The most useful physical property for identifying galena would be its metallic luster and its high density. Galena has a metallic luster and is one of the densest minerals, so these characteristics can be helpful in distinguishing it from other minerals.
Density is useful for identifying an unknown material because it is a physical constant. A physical constant is a unique characteristic of the material in question. This constant never change or vary with the shape or amount of the material/substance.
The most useful physical property for identifying an unknown substance is its melting point. This property is characteristic of a substance and can help distinguish it from others, as pure substances have specific melting points. Additionally, comparing the melting point of the unknown with known values can provide a quick and reliable identification method. Other useful physical properties may include boiling point, density, and solubility, but melting point is often the most definitive.
The most useful physical property when classifying a rock is its mineral composition. This includes identifying the specific minerals present in the rock and their relative proportions. By analyzing these properties, geologists can categorize rocks into different types based on their mineral content.
physical property
Color, It can point you in the right direction but color lies all the time
The state of matter is a physical property.
physical property
It is a physical property.
Dullness is a physical property.
i am pretty sure it is a physical property! :)