Borrowing from a Sami language (compare Southern Sami gaasoe (“cold mist”)), from Proto-Samic *kāsō, from Proto-Uralic *käsä (“dew”). Originally a dialect word meaning 'mist, fog', adopted as an equivalent of gas by by Finnish physician and author Samuel Roos in 1845, by phonetic similarity with Dutch gas (whence words in many other European languages, such as English gas).
kaasu
| Inflection of kaasu (Kotus type 1/valo, no gradation) | |||
|---|---|---|---|
| nominative | kaasu | kaasut | |
| genitive | kaasun | kaasujen | |
| partitive | kaasua | kaasuja | |
| illative | kaasuun | kaasuihin | |
| singular | plural | ||
| nominative | kaasu | kaasut | |
| accusative | nom. | kaasu | kaasut |
| gen. | kaasun | ||
| genitive | kaasun | kaasujen | |
| partitive | kaasua | kaasuja | |
| inessive | kaasussa | kaasuissa | |
| elative | kaasusta | kaasuista | |
| illative | kaasuun | kaasuihin | |
| adessive | kaasulla | kaasuilla | |
| ablative | kaasulta | kaasuilta | |
| allative | kaasulle | kaasuille | |
| essive | kaasuna | kaasuina | |
| translative | kaasuksi | kaasuiksi | |
| abessive | kaasutta | kaasuitta | |
| instructive | — | kaasuin | |
| comitative | See the possessive forms below. | ||