A feature of matter that can be observed or measured is called a property.

Here's a breakdown:

* Matter: Anything that has mass and takes up space.

* Property: A characteristic that describes matter.

Types of Properties:

* Physical Properties: Can be observed or measured without changing the substance's chemical composition. Examples include:

* Color

* Density

* Melting point

* Boiling point

* Hardness

* Solubility

* Conductivity

* Chemical Properties: Describe how a substance reacts with other substances or changes its chemical composition. Examples include:

* Flammability

* Reactivity with acids

* Corrosion resistance

Let me know if you want to explore specific properties in more detail!