Pure Substances

A pure substance is a form of matter that has a consistent composition and properties throughout, meaning it contains only one type of particle, such as atoms or molecules. Examples include pure water, which is H₂O, or pure gold. These substances have specific melting points, boiling points, and other characteristics, making them distinct from mixtures, which are composed of two or more different substances combined physically. Pure substances can be elements or compounds, and their uniformity allows for precise scientific study and usage.