Läpäisevät

läpäisevät is a Finnish word with two common functions: it is the third-person plural present tense form of the verb läpäistä, meaning “they permeate” or “they pass through,” and it is the plural nominative form of the adjective läpäisevä, meaning “permeable” or “penetrative.” The two uses share a root tied to the idea of crossing or passing through a barrier or medium.

As a verb form, läpäisevät appears in sentences describing processes where substances, signals, or other entities cross a barrier. For example: kalvot läpäisevät pienemmät molekyylejä, or more generally, erilaiset kalvot voivat läpäiseä erikokoisia aineita. In these contexts, the subject is plural (for example, several membranes or barriers).

As an adjective, läpäisevä means permeable. The form läpäisevät is the plural nominative of this adjective and is used to modify plural nouns, for instance läpäisevät kalvot (permeable membranes) or läpäisevät aineet (permeable substances). The related noun form is läpäisy, referring to permeability or permeation, and is commonly used in technical and scientific language.

Applications and usage. In biology and medicine, läpäisevyys describes how easily substances cross cell membranes or tissues, influencing drug delivery and biological barriers. In materials science and physics, the term appears in discussions of barrier properties, filtration, and radiation or fluid permeation. The concept is closely linked to permeability coefficients and the study of selective transport.

See also: läpäisykyky, permeabilité, permeability.