Tiheyksissä

Tiheyksissä is the inessive plural form of the Finnish noun tiheys, meaning density, crowding, or concentration. The word is used when speaking about densities in multiple contexts or locations, such as population density, physical density, or the concentration of substances. While tiheys has several senses, tiheyksissä specifically marks “in the densities” and is common in statistical or scientific language when contrasting densities across regions, groups, or conditions.

In Finnish grammar, tiheyksissä is formed by taking the plural stem tiheyks- and attaching the inessive plural ending -issä. The corresponding singular form is tiheydessä (in the density). This pattern illustrates how Finnish uses case endings to express spatial or contextual relations for both singular and plural nouns. The form tiheyksissä is therefore a regular realization of a plural inessive construction for tiheys.

Usage notes and examples:

- Alueiden tiheyksissä on suuria eroja. (There are large differences in the densities across regions.)

- Tilastot osoittavat tiheyksissä esiintyvää vaihtelua. (Statistics show variation present in the densities.)

Tiheyksissä is most appropriate in formal or technical writing, such as reports, articles, or datasets, where multiple density values or categories are being discussed. It is not a separate semantic concept but a grammatical form that enables precise reference to densities in multiple contexts.