A more thorough explanation:

Composition of matter is a type of patentable subject matter that includes combinations of natural elements resulting from chemical union or mechanical mixture. It can be in the form of gases, fluids, powders, or solids. The subject matter always refers to the substance itself, rather than its form or shape.

Examples of composition of matter include:

• Chemical compounds such as drugs and fuels
• Physical products such as plastics and particleboard
• New life forms made by genetic engineering

These examples illustrate how composition of matter can refer to a wide range of substances, from chemicals to physical products to living organisms. The focus is always on the substance itself, rather than how it is made or its shape.