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Definition 2025
valon_nopeus
valon nopeus
See also: valonnopeus
Finnish
Alternative forms
Noun
valon nopeus
- The speed of light in a medium.
- The speed of light in a vacuum.
Declension
| Inflection of valon nopeus (Kotus type 40/kalleus, t-d gradation) | |||
|---|---|---|---|
| nominative | valon nopeus | valon nopeudet | |
| genitive | valon nopeuden | valon nopeuksien | |
| partitive | valon nopeutta | valon nopeuksia | |
| illative | valon nopeuteen | valon nopeuksiin | |
| singular | plural | ||
| nominative | valon nopeus | valon nopeudet | |
| accusative | nom. | valon nopeus | valon nopeudet |
| gen. | valon nopeuden | ||
| genitive | valon nopeuden | valon nopeuksien | |
| partitive | valon nopeutta | valon nopeuksia | |
| inessive | valon nopeudessa | valon nopeuksissa | |
| elative | valon nopeudesta | valon nopeuksista | |
| illative | valon nopeuteen | valon nopeuksiin | |
| adessive | valon nopeudella | valon nopeuksilla | |
| ablative | valon nopeudelta | valon nopeuksilta | |
| allative | valon nopeudelle | valon nopeuksille | |
| essive | valon nopeutena | valon nopeuksina | |
| translative | valon nopeudeksi | valon nopeuksiksi | |
| instructive | — | valon nopeuksin | |
| abessive | valon nopeudetta | valon nopeuksitta | |
| comitative | — | valon nopeuksineen | |
Usage notes
Formerly valon nopeus was always written as two separate words. It is becoming customary to write the two words together (valonnopeus), when one refers to the speed of light in a vacuum (which is a universal constant, marked with c and equivalent to 299,792,458 m/s), and separately, when one refers to the actual light speed in a given medium (v < c). The usage is rather confused and either of the two forms may refer to either of the meanings.