läpäise

Läpäise is a Finnish verb meaning to pass through, permeate, or penetrate. It describes both physical processes—where a substance, energy, or force moves through a barrier—and more abstract permeation, such as an idea or influence spreading through a group or system.

Etymology and related forms: Läpäistä is the base verb; related nouns include läpäisy (permeation, permeability) and läpäisevä (permeable). The verb has regular Finnish conjugation. In the present tense forms are: minä läpäisen, sinä läpäiset, hän läpäisee, me läpäisemme, te läpäisette, he läpäisevät. The imperative is läpäise, and the past participle is läpäissyt.

Usage and contexts: The term is common in physics, chemistry, biology, and materials science to describe permeability or the ability of a medium to let substances pass. Examples: Valo läpäisee ikkunan (Light passes through the window). Kaasut läpäisevät kalvon (Gases permeate the membrane). In medicine or physiology, membraanien läpäisykyky refers to the rate at which a substance crosses a biological barrier.

Nuances and style: Läpäise can be used both literally and metaphorically, but in everyday speech speakers often prefer more common phrasing for everyday permeation. In technical contexts, läpäisykyky and läpäisevä materiaali are standard terms describing a material’s permeability.

See also:

- läpäisykyky

- läpäisevä

- läpäistä

The entry provides a concise overview of the Finnish verb läpäise, its meaning, forms, and typical usage across contexts.