hiilin

Hiilin is the inflected form of the Finnish noun hiili, which denotes carbon. The form does not denote a distinct chemical substance by itself; instead it appears in Finnish phrases to express possession or to form descriptive compounds.

Carbon is a chemical element with symbol C and atomic number 6. It is a nonmetal and forms the basis of organic chemistry, capable of forming long chains and a wide variety of structures. Its most common allotropes are graphite and diamond, with amorphous carbon also widely encountered.

In nature, carbon occurs in several reservoirs, including atmospheric carbon dioxide, organic matter in plants and animals, soils, and carbonate minerals such as calcite and dolomite. Industrially, carbon is used to produce steel (as coke), activated carbon for filtration, carbon black for various industrial applications, and advanced materials such as graphene.

The carbon cycle connects processes such as photosynthesis, respiration, decay, and geological transformations. Human activities release substantial amounts of CO2 into the atmosphere, influencing climate. Efforts to manage carbon include reducing emissions, enhancing carbon sinks, and exploring carbon capture and storage technologies.