| JTurb | Journal of Turbulence | In English | → Serial publications, periodicals → Physics |
| JVC | Journal of Vibration and Control | In English | → Serial publications, periodicals → Acoustics |
| JVE | Journal of Vibration Engineering | In English | → Serial publications, periodicals → Acoustics |
| JVGR | Journal of Volcanology and Geothermal Research | In English | → Serial publications, periodicals → 55121 |
| JVST | Journal of Vacuum Science Technology | In English | → Serial publications, periodicals → Physics |
| JWasA | Journal of the Washington Academy of Sciences | In English | → Serial publications, periodicals |
| JWMSE | Journal of Women and Minorities in Science and Engineering | In English | → Serial publications, periodicals → Sociology → Feminism → Engineering, technology |
| JWUDF | Jahns Wöchentliche Unterhaltungen für Dilettanten und Freunde der Astronomie, Geographie und Witterungskunde | In German | → Serial publications, periodicals → Astronomy → Meteorology, climatology → Geography |
| JXST | Journal of X-Ray Science and Technology | In English | → Serial publications, periodicals → Electromagnetism → Nuclear, atomic, and molecular physics |
| K | Potassi = K | Potassium | In English = K | Kalium | In Afrikaans = K | بوتاسيوم | In Arabic = K | Potasiu | In Asturian = K | পটাশিয়াম | In Bengali = K | Калій | In Belarusian = K | Kalijum | In Bosnian = K | Калий | In Bulgarian = K | Potassi | In Catalan = K | Draslík | In Czech = K | Potassiu | In Corsican = K | Potasiwm | In Welsh = K | Kalium | In Danish = K | Kalium | In German = K | ޕޮޓޭސިއަމް | In Dhivehi = K | Kaalium | In Estonian = K | Κάλιο | In Greek = K | Potasio | In Spanish = K | Kalio | In Esperanto = K | Potasio | In Basque = K | پتاسیم | In Persian = K | Potassium | In French = K | Potaisiam | In Irish = K | Potashum | In Manx = K | Potasio | In Galician = K | 칼륨 | In Korean = K | Կալիում | In Armenian = K | पोटासियम | In Hindi = K | Kalij | In Croatian = K | Kalio | In Ido = K | Kalium | In Indonesian = K | Kalín | In Icelandic = K | Potassio | In Italian = K | אשלגן | In Hebrew = K | Kalium | JV = K | ಪೊಟ್ಯಾಶಿಯಮ್ | In Kannada = K | Kali | In Swahili = K | Potasyòm | In Haitian Creole = K | Qelye | In Kurdish = K | Kalium | In Latin = K | Kālijs | In Latvian = K | Kalium | In Letzeburgesh = K | Kalis | In Lithuanian = K | sodnrkali | In Lojban = K | Kálium | In Hungarian = K | Калиум | In Macedonian = K | പൊട്ടാസ്യം | In Malayalam = K | Konurehu | In Māori = K | Kalium | In Malay = K | Kalium | In Dutch = K | カリウム | In Japanese = K | Kalium | In Norwegian = K | Kalium | In Nynorsk = K | Kalium | NOV = K | Potassi | In Occitan = K | Kaliy | In Uzbek = K | Kalium | In Low German = K | Potas | In Polish = K | Potássio | In Portuguese = K | Potasiu | In Romanian = K | Kalyu | In Quechua = K | Калий | In Russian = K | Kaliumi | In Albanian = K | Putassiu | In Sicilian = K | Draslík | In Slovak = K | Kalij | In Slovenian = K | Калијум | In Serbian = K | Kalij | In Serbo-Croatian = K | Kalium | In Finnish = K | Kalium | In Swedish = K | โพแทสเซียม | In Thai = K | Kali | In Vietnamese = K | Калий | In Tajik = K | Potasyum | In Turkish = K | Калій | In Ukrainian = K | وٹاشیم | UR = K | Potassiom | In Walloon = K | Kalium | In Vlaams = K | 钾 | In Chinese |
In Friulian | → Chemistry |
| K | โพแทสเซียม = (look above) |
In Thai | → Chemistry |
| K | ޕޮޓޭސިއަމް = (look above) |
In Dhivehi | → Chemistry |
| K | Kalium = (look above) |
In German | → Chemistry |
| K | Kalium = (look above) |
In Swedish | → Chemistry |
| K | Kalium = (look above) |
In Finnish | → Chemistry |
| K | Kalij = (look above) |
In Serbo-Croatian | → Chemistry |
| K | Калијум = (look above) |
In Serbian | → Chemistry |
| K | Kalij = (look above) |
In Slovenian | → Chemistry |
| K | Kalium = (look above) |
In Vlaams | → Chemistry |
| K | Putassiu = (look above) |
In Sicilian | → Chemistry |
| K | Kaliumi = (look above) |
In Albanian | → Chemistry |
| K | Калий = (look above) |
In Russian | → Chemistry |
| K | Kalyu = (look above) |
In Quechua | → Chemistry |
| K | Potasiu = (look above) |
In Romanian | → Chemistry |
| K | Kaalium = (look above) |
In Estonian | → Chemistry |
| K | Kali = (look above) |
In Vietnamese | → Chemistry |
| K | Калий = (look above) |
In Tajik | → Chemistry |
| K | Potassium = (look above) |
In French | → Chemistry |
| K | Potashum = (look above) |
In Manx | → Chemistry |
| K | 칼륨 = (look above) |
In Korean | → Chemistry |
| K | پتاسیم = (look above) |
In Persian | → Chemistry |
| K | Potasio = (look above) |
In Basque | → Chemistry |
| K | 钾 = (look above) |
In Chinese | → Chemistry |
| K | Kalio = (look above) |
In Esperanto | → Chemistry |
| K | Potasio = (look above) |
In Spanish | → Chemistry |
| K | Potassiom = (look above) |
In Walloon | → Chemistry |
| K | وٹاشیم = (look above) |
[UR] | → Chemistry |
| K | Калій = (look above) |
In Ukrainian | → Chemistry |
| K | Potasyum = (look above) |
In Turkish | → Chemistry |
| K | Potaisiam = (look above) |
In Irish | → Chemistry |
| K | Κάλιο = (look above) |
In Greek | → Chemistry |
| K | Draslík = (look above) |
In Slovak | → Chemistry |
| K | Potássio = (look above) |
In Portuguese | → Chemistry |
| K | Kalis = (look above) |
In Lithuanian | → Chemistry |
| K | Kalium = (look above) |
In Letzeburgesh | → Chemistry |
| K | Kālijs = (look above) |
In Latvian | → Chemistry |
| K | Potasyòm = (look above) |
In Haitian Creole | → Chemistry |
| K | Kali = (look above) |
In Swahili | → Chemistry |
| K | ಪೊಟ್ಯಾಶಿಯಮ್ = (look above) |
In Kannada | → Chemistry |
| K | Kalium = (look above) |
In Latin | → Chemistry |
| K | Kalium = (look above) |
[JV] | → Chemistry |
| K | पोटासियम = (look above) |
In Hindi | → Chemistry |
| K | Kalij = (look above) |
In Croatian | → Chemistry |
| K | Kalio = (look above) |
In Ido | → Chemistry |
| K | Kalium = (look above) |
In Indonesian | → Chemistry |
| K | Kalín = (look above) |
In Icelandic | → Chemistry |
| K | Potassio = (look above) |
In Italian | → Chemistry |
| K | Կալիում = (look above) |
In Armenian | → Chemistry |
| K | sodnrkali = (look above) |
In Lojban | → Chemistry |
| K | Kálium = (look above) |
In Hungarian | → Chemistry |
| K | Potas = (look above) |
In Polish | → Chemistry |
| K | Kalium = (look above) |
In Low German | → Chemistry |
| K | Kaliy = (look above) |
In Uzbek | → Chemistry |
| K | Potassi = (look above) |
In Occitan | → Chemistry |
| K | Kalium = (look above) |
[NOV] | → Chemistry |
| K | Kalium = (look above) |
In Nynorsk | → Chemistry |
| K | Kalium = (look above) |
In Norwegian | → Chemistry |
| K | カリウム = (look above) |
In Japanese | → Chemistry |
| K | Kalium = (look above) |
In Dutch | → Chemistry |
| K | Kalium = (look above) |
In Malay | → Chemistry |
| K | Qelye = (look above) |
In Kurdish | → Chemistry |
| K | Konurehu = (look above) |
In Māori | → Chemistry |
| K | പൊട്ടാസ്യം = (look above) |
In Malayalam | → Chemistry |
| K | Калиум = (look above) |
In Macedonian | → Chemistry |
| K | אשלגן = (look above) |
In Hebrew | → Chemistry |
| K | Kalium = (look above) |
In Danish | → Chemistry |
| K | Potasiwm = (look above) |
In Welsh | → Chemistry |
| K | Potasio = (look above) |
In Galician | → Chemistry |
| K | Potassium = (look above) |
In English | → Chemistry |
| K | Kalium = (look above) |
In Afrikaans | → Chemistry |
| K | بوتاسيوم = (look above) |
In Arabic | → Chemistry |
| K | Potasiu = (look above) |
In Asturian | → Chemistry |
| K | পটাশিয়াম = (look above) |
In Bengali | → Chemistry |
| K | Калій = (look above) |
In Belarusian | → Chemistry |
| K | Kalijum = (look above) |
In Bosnian | → Chemistry |
| K | Калий = (look above) |
In Bulgarian | → Chemistry |
| K | Potassi = (look above) |
In Catalan | → Chemistry |
| K | Draslík = (look above) |
In Czech | → Chemistry |
| K | Potassiu = (look above) |
In Corsican | → Chemistry |
| K | Лізин = K | Lysine | In English = K | ليسين | In Arabic = K | লাইসিন | In Bengali = K | Lisina | In Catalan = K | Lysin | In Czech = K | Lysin | In German = K | Lisina | In Spanish = K | Lizino | In Laotian = K | Lysine | In French = K | 리신 | In Korean = K | Lizin | In Croatian = K | Lisin | In Indonesian = K | Lisina | In Italian = K | ליזין | In Hebrew = K | Lizīns | In Latvian = K | Lysin | In Letzeburgesh = K | Lizinas | In Lithuanian = K | Lizin | In Hungarian = K | Lysine | In Dutch = K | リシン | In Japanese = K | Lizyna | In Polish = K | Lisina | In Portuguese = K | Лизин | In Russian = K | Lysiini | In Finnish = K | Lizin | In Turkish = K | 赖氨酸 | In Chinese |
In Ukrainian | → Biochemistry, biophysics |
| K | ليسين = (look above) |
In Arabic | → Biochemistry, biophysics |
| K | Lysine = (look above) |
In English | → Biochemistry, biophysics |
| K | Lysine = (look above) |
In Dutch | → Biochemistry, biophysics |
| K | Lizin = (look above) |
In Turkish | → Biochemistry, biophysics |
| K | Lysiini = (look above) |
In Finnish | → Biochemistry, biophysics |
| K | Лизин = (look above) |
In Russian | → Biochemistry, biophysics |
| K | ליזין = (look above) |
In Hebrew | → Biochemistry, biophysics |
| K | 리신 = (look above) |
In Korean | → Biochemistry, biophysics |
| K | リシン = (look above) |
In Japanese | → Biochemistry, biophysics |
| K | Lisina = (look above) |
In Portuguese | → Biochemistry, biophysics |
| K | 赖氨酸 = (look above) |
In Chinese | → Biochemistry, biophysics |
| K | Lizyna = (look above) |
In Polish | → Biochemistry, biophysics |
| K | Lisina = (look above) |
In Italian | → Biochemistry, biophysics |
| K | Lisin = (look above) |
In Indonesian | → Biochemistry, biophysics |
| K | Lysine = (look above) |
In French | → Biochemistry, biophysics |
| K | লাইসিন = (look above) |
In Bengali | → Biochemistry, biophysics |
| K | Lizino = (look above) |
In Laotian | → Biochemistry, biophysics |
| K | Lisina = (look above) |
In Spanish | → Biochemistry, biophysics |
| K | Lizīns = (look above) |
In Latvian | → Biochemistry, biophysics |
| K | Lysin = (look above) |
In Letzeburgesh | → Biochemistry, biophysics |
| K | Lysin = (look above) |
In German | → Biochemistry, biophysics |
| K | Lysin = (look above) |
In Czech | → Biochemistry, biophysics |
| K | Lizinas = (look above) |
In Lithuanian | → Biochemistry, biophysics |
| K | Lizin = (look above) |
In Hungarian | → Biochemistry, biophysics |
| K | Lisina = (look above) |
In Catalan | → Biochemistry, biophysics |
| K | Lizin = (look above) |
In Croatian | → Biochemistry, biophysics |
| KAERI | Korea Atomic Energy Research Institute (www.kaeri.re.kr) | In English | → Research institutes → Atomic physics |
| KAEST | Konferenco pri Aplikoj de Esperanto en Scienco kaj Tekniko | In Esperanto | → Congresses → Applied sciences, technology |
| KAIST | Korea Advanced Institute of Science and Technology | In English | → Applied sciences, technology |
| KAM | Kwetsbaarheid, Adaptatie, Mitigatie | In Dutch | → Social sciences → Meteorology, climatology |
| KAR | Kainate Receptor | In English | → Biochemistry, biophysics |
| KASTN | Korean-American Science and Technology News | In English | → Newspapers, journalism → Engineering, technology |
| KEA | Klimaschutz- und Energieagentur | In German | → Meteorology, climatology → Energy economics |
| KHPM | Kininogène de Haut Poids Moléculaire | In French | → Biochemistry, biophysics |
| KiCat | Kinetics and Catalysis | In English | → Serial publications, periodicals → Chemistry |
| KliBA | Klimaschutz- und Energie-Beratungsagentur | In German | → Meteorology, climatology → Energy economics |
| KMI | Koninklijk Meteorologisch Instituut = IRM | Institut Royal Météorologique de Belgique | In French |
In Dutch | → Meteorology, climatology |
| KNAW | Koninklijke Nederlandse Akademie van Wetenschappen | In Dutch | → Academies |
| KNMI | Koninklijk Nederlands Meteorologisch Instituut (www.knmi.nl) | In Dutch | → Research institutes → Meteorology, climatology |
| KodOB | Kodaikanal Observatory Bulletins | In English | → Serial publications, periodicals → Astronomy |
| KodRe | Kodaikanal Observatory Reprints | In English | → Serial publications, periodicals → Astronomy |
| KOMP | Knockout Mouse Project | In English | → Biological sciences |
| KPM | Kometen, Planetoiden, Meteore | In German | → Solar system |
| KPNO | Kitt Peak National Observatory | In English | → Observatories |
| KVeBB | Kleine Veröffentlichungen der Universitätssternwarte zu Berlin Babelsberg | In German | → Serial publications, periodicals → Astronomy |
| L | Leucinas = L | Leucine | In English = L | Leucina | In Catalan = L | Leucin | In Danish = L | Leucin | In German = L | Leucina | In Spanish = L | Leŭcino | In Esperanto = L | Leucine | In French = L | 류신 | In Korean = L | Leucin | In Croatian = L | Leusin | In Indonesian = L | Leucina | In Italian = L | לאוצין | In Hebrew = L | Leicīns | In Latvian = L | Leucin | In Letzeburgesh = L | Leucine | In Dutch = L | ロイシン | In Japanese = L | Leucin | In Norwegian = L | Leucyna | In Polish = L | Leucina | In Portuguese = L | Лейцин | In Russian = L | Leusiini | In Finnish = L | Leucin | In Swedish = L | Lösin | In Turkish = L | Лейцин | In Ukrainian = L | 亮氨酸 | In Chinese |
In Lithuanian | → Biochemistry, biophysics |
| L | Leucine = (look above) |
In Dutch | → Biochemistry, biophysics |
| L | ロイシン = (look above) |
In Japanese | → Biochemistry, biophysics |
| L | Leucin = (look above) |
In Norwegian | → Biochemistry, biophysics |
| L | Leucyna = (look above) |
In Polish | → Biochemistry, biophysics |
| L | Leucina = (look above) |
In Portuguese | → Biochemistry, biophysics |
| L | Лейцин = (look above) |
In Russian | → Biochemistry, biophysics |
| L | Leucin = (look above) |
In Letzeburgesh | → Biochemistry, biophysics |
| L | Leicīns = (look above) |
In Latvian | → Biochemistry, biophysics |
| L | Leŭcino = (look above) |
In Esperanto | → Biochemistry, biophysics |
| L | Leucina = (look above) |
In Spanish | → Biochemistry, biophysics |
| L | Leucin = (look above) |
In German | → Biochemistry, biophysics |
| L | Leucin = (look above) |
In Danish | → Biochemistry, biophysics |
| L | Leucina = (look above) |
In Catalan | → Biochemistry, biophysics |
| L | Leucine = (look above) |
In French | → Biochemistry, biophysics |
| L | 류신 = (look above) |
In Korean | → Biochemistry, biophysics |
| L | Leucin = (look above) |
In Croatian | → Biochemistry, biophysics |
| L | Leucine = (look above) |
In English | → Biochemistry, biophysics |
| L | Leusin = (look above) |
In Indonesian | → Biochemistry, biophysics |
| L | לאוצין = (look above) |
In Hebrew | → Biochemistry, biophysics |
| L | 亮氨酸 = (look above) |
In Chinese | → Biochemistry, biophysics |
| L | Leucin = (look above) |
In Swedish | → Biochemistry, biophysics |
| L | Leucina = (look above) |
In Italian | → Biochemistry, biophysics |
| L | Leusiini = (look above) |
In Finnish | → Biochemistry, biophysics |
| L | Лейцин = (look above) |
In Ukrainian | → Biochemistry, biophysics |
| L | Lösin = (look above) |
In Turkish | → Biochemistry, biophysics |
| LACE | Laboratoire d'Application de la Chimie à l'Environnement | In French | → Research institutes → Nature → Environment, environmental sciences → Chemistry |
| LACIS | Leipzig Aerosol Cloud Interaction Simulator | In English | → Meteorology, climatology |
| LADA | Land Degradation Assessment in Drylands | In English | → Nature → Environment, environmental sciences → Earth sciences |
| LAEPSI | Laboratoire d'Analyse Environnementale des Procédés et des Systèmes Industriels | In French | → Research institutes → Nature → Environmental technology, water supply, waste management |
| LaFoc | Laser Focus | In English | → Serial publications, periodicals → Physics |
| LAGEOS | Laser Geodynamic Satellite | In English | → Earth sciences → Spaceflight engineering, astronautics |
| LAGEOS | Laser Geodynamics Satellite | In English | → Geophysics → Spaceflight engineering, astronautics |
| LAI | Latex Agglutination Assay | In English | → Biochemistry, biophysics |
| LAIRT | Large-Aperture Infrared Telescope | In English | → Astronomy |
| LAMCOS | Laboratoire de Mécanique des Contacts et des Solides | In French | → Research institutes → 531 |
| LAMMR | Large-Antenna Multichannel Microwave Radiometer | In English | → Astronomy |
| LAMP | Lyman-Alpha Mapping Project | In English | → Astronomy |
| LaPhy | Laser Physics | In English | → Serial publications, periodicals → Physics |
| LAPP | Laboratoire d’Annecy-le-Vieux de Physique des Particules | In French | → Research institutes → Nuclear, atomic, and molecular physics |
| LAPSS | Large-Area Pulse Solar Simulator | In English | → Astronomy |
| LAREG | Laboratoire de Recherche en Géodésie | In French | → Research institutes → Geodesy, cartography |
| LASA | Laboratory Animal Science Association (www.lasa.co.uk) | In English | → Associations → Zoology → Veterinary medicine |
| LASCO | Large Angle Spectrometric Coronograph | In English | → Solar system → Analytical chemistry |
| LASER | Lum-Amplifo per Stimulata Eligo de Radioj | In Esperanto | → Electromagnetism |
| LASER | Light Amplification by Stimulated Emission of Radiation | In English | → Physics → Engineering, technology |
| LasJ | Laser Journal | In English | → Serial publications, periodicals → Physics |
| LASS | Large-Amplitude Space Simulator | In English | → Astronomy → Spaceflight engineering, astronautics |
| LC-MS | Liquid Chromatography-Mass Spectrometry | In English | → Chemistry |
| LCC | Laboratoire de Chimie de Coordination | In French | → Research institutes → Chemistry |
| LCM | Least Common Multiple | In English | → Mathematics |
| LCMV | Lymphocytic Choriomeningitis Virus | In English | → Virology |
| LCROSS | Lunar Crater Observation and Sensing Satellite | In English | → Astronomy → Spaceflight engineering, astronautics |
| LDA | Local Density Approximation | In English | → Atomic physics |
| LDH | Lactate Dehydrogenase | In English | → Enzymes |
| LDL | Low-Density Lipoprotein | In English | → Biochemistry, biophysics |
| LDL | Low Density Lipoprotein | In English | → Biochemistry, biophysics |
| LDLR | Low-Density Lipoprotein Receptor | In English | → Biochemistry, biophysics |
| LEBM | Laboratoire Européen de Biologie Moléculaire | In French | → Research institutes → Biochemistry, biophysics |
| LEDSS | Laboratoire d'Études Dynamiques et Structurales de la Sélectivité | In French | → Research institutes → Chemistry → Biochemistry, biophysics |
| LEFM | Linear Elasticity Fracture Mechanics | In English | → Physics |
| LEGMA | Latvian Environment, Geological and Meterological Agency | In English | → Nature → Environment, environmental sciences → Earth sciences → Meteorology, climatology |
| LEM | Lunar Excursion Module | In English | → Planets and satellites → Spaceflight engineering, astronautics |
| LEND | Lunar Exploration Neutron Detector | In English | → Astronomy |
| LEO | Low Earth Orbit | In English | → Astronomy → Spaceflight engineering, astronautics |
|