HalomethaneHalomethane compounds are derivatives of methane () with one or more of the hydrogen atoms replaced with halogen atoms (F, Cl, Br, or I). Halomethanes are both naturally occurring, especially in marine environments, and human-made, most notably as refrigerants, solvents, propellants, and fumigants. Many, including the chlorofluorocarbons, have attracted wide attention because they become active when exposed to ultraviolet light found at high altitudes and destroy the Earth's protective ozone layer.
Photographic magnitudePhotographic magnitude (mph or mp ) is a measure of the relative brightness of a star or other astronomical object as imaged on a photographic film emulsion with a camera attached to a telescope. An object's apparent photographic magnitude depends on its intrinsic luminosity, its distance and any extinction of light by interstellar matter existing along the line of sight to the observer. Photographic observations have now been superseded by electronic photometry such as CCD charge-couple device cameras that convert the incoming light into an electric current by the photoelectric effect.
Finnish languageFinnish (endonym: suomi ˈsuo̯mi or suomen kieli ˈsuo̯meŋ ˈkie̯li) is a Uralic language of the Finnic branch, spoken by the majority of the population in Finland and by ethnic Finns outside of Finland. Finnish is one of the two official languages of Finland (the other being Swedish). In Sweden, both Finnish and Meänkieli (which has significant mutual intelligibility with Finnish) are official minority languages. The Kven language, which like Meänkieli is mutually intelligible with Finnish, is spoken in the Norwegian county Troms og Finnmark by a minority group of Finnish descent.
Finnish grammarThe Finnish language is spoken by the majority of the population in Finland and by ethnic Finns elsewhere. Unlike the languages spoken in neighbouring countries, such as Swedish and Norwegian, which are North Germanic languages, or Russian, which is a Slavic language, Finnish is a Uralic language of the Finnic languages group. Typologically, Finnish is agglutinative. As in some other Uralic languages, Finnish has vowel harmony, and like other Finnic languages, it has consonant gradation.
