läpäisemällä

läpäisemällä is a Finnish verb form derived from the verb Läpäistä, meaning to permeate or pass through. It functions as the gerundive form of the verb, often translated into English as "by permeating" or "through permeation." The form is created with the suffix -malla, yielding läpäisemällä, and is used to express the means or method by which an action occurs. In Finnish, such -malla forms are used adverbially to indicate instrumentality or manner.

Usage notes: The gerund läpäisemällä is common in formal, technical, and scientific writing, where processes are described in terms of how they are accomplished. It can connect to a following noun to specify the material or medium involved (for example, kalvon läpäisemällä meaning “by permeating the membrane”). In everyday language, other constructions—such as clauses with finite verbs—are more frequent, but läpäisemällä remains a correct and clear way to express method or means when emphasis is on the process.

Related terms include läpäiseminen (the act of permeating), läpäisy (permeability), and läpäisykyky (permeability capacity). The concept appears across domains such as physics (diffusion and transmission), biology (cell membranes), and materials science, where describing how substances move through barriers is relevant.

See also: Läpäiseminen, Läpäisy, Läpäisykyky.