mda

The dalton or unified atomic mass unit (symbols: Da or u) is a unit of mass widely used in physics and chemistry. It is defined as 1/12 of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest. The atomic mass constant, denoted mu is defined identically, giving mu = m(12C)/12 = 1 Da.This unit is commonly used in physics and chemistry to express the mass of atomic-scale objects, such as atoms, molecules, and elementary particles, both for discrete instances and multiple types of ensemble averages. For example, an atom of helium-4 has a mass of 4.0026 Da. This is an intrinsic property of the isotope and all helium-4 have the same mass. Acetylsalicylic acid (aspirin), C9H8O4, has an average mass of approximately 180.157 Da. However, there are no acetylsalicylic acid molecules with this mass. The two most common masses of individual acetylsalicylic acid molecules are 180.04228 Da and 181.04565 Da.
The molecular masses of proteins, nucleic acids, and other large polymers are often expressed with the units kilodaltons (kDa), megadaltons (MDa), etc. Titin, one of the largest known proteins, has a molecular mass of between 3 and 3.7 megadaltons. The DNA of chromosome 1 in the human genome has about 249 million base pairs, each with an average mass of about 650 Da, or 156 GDa total.The mole is a unit of amount of substance, widely used in chemistry and physics, which was originally defined so that the mass of one mole of a substance, measured in grams, would be numerically equal to the average mass of one of its constituent particles, measured in daltons. That is, the molar mass of a chemical compound was meant to be numerically equal to its average molecular mass. For example, the average mass of one molecule of water is about 18.0153 daltons, and one mole of water is about 18.0153 grams. A protein whose molecule has an average mass of 64 kDa would have a molar mass of 64 kg/mol. However, while this equality can be assumed for almost all practical purposes, it is now only approximate, because of the way mole was redefined on 20 May 2019.In general, the mass in daltons of an atom is numerically close, but not exactly equal to the number of nucleons A contained in its nucleus. It follows that the molar mass of a compound (grams per mole) is numerically close to the average number of nucleons contained in each molecule. By definition, the mass of an atom of carbon-12 is 12 daltons, which corresponds with the number of nucleons that it has (6 protons and 6 neutrons). However, the mass of an atomic-scale object is affected by the binding energy of the nucleons in its atomic nuclei, as well as the mass and binding energy of its electrons. Therefore, this equality holds only for the carbon-12 atom in the stated conditions, and will vary for other substances. For example, the mass of one unbound atom of the common hydrogen isotope (hydrogen-1, protium) is 1.007825032241(94) Da, the mass of one free neutron is 1.00866491595(49) Da, and the mass of one hydrogen-2 (deuterium) atom is 2.014101778114(122) Da. In general, the difference (mass defect) is less than 0.1%; exceptions include hydrogen-1 (about 0.8%), helium-3 (0.5%), lithium (0.25%) and beryllium (0.15%).
The unified atomic mass unit and the dalton should not be confused with the unit of mass in the atomic units systems, which is instead the electron rest mass (me).

View More On Wikipedia.org
Recent contents

  1. Nimetoka kumzika mshauri wangu wa afya alieniambia nitakufa muda mfupi kwa kumix energy drink na K Vant

    Habari Wakuu. Binafsi sijaleta mada hapa kama njia ya kutetea watu kuishi maisha yanayohatarisha afya zao. Ila nakumbusha tu kwamba hapa JF kufikia 20100, wote hatutakuwepo pasipo kujali wanaolinda Afya na wasiolinda. Binafsi mimi napenda kuishi katika maisha yanayonipa furaha ila licha ya...

  2. Congo: Wanadiplomasia wameondolewa Bukavu wamepekwa Rwanda. Nadhani Bukavu kutawaka moto mda siyo mrefu

    Waasi wa M23 wameingia Kavumu ni km 25 toka Bukavu airport hatua hiyo imepeleka wanadiplomasia kuondelea Bukavu kwenda Rwanda, tutegemee kuona mapigano ktk jiji la Bukavu siku siyo nyingi.

  3. Afrika Kusini wasijaribu kutaka kuzichapa na Rwanda. Watachakazwa vibaya sana

    Kagame anajiamini anajua anachofanya. Kumwambia SA kuwa "ukitaka kupigana njoo...... " Anajua kuwa SA. hawana jeshi lenye nidhamu na pia hawaifahamu Congo na Misitu yake. Huwezi pigana na Kagame katika misitu ya Congo atakuchapa. Anaifahamu vizuri. Labda sasa mpigane kwa kurushiana mabomu tu...
    • Minjingu Jingu
    • Thread
    • africa cyril ramaphosa hata kagame mda naona paul kagame rwanda vs afrika kusini south africa wowote
    • Replies: 207
    • Forum: International Forum
  4. N

    Walinzi wa Rais wa Liberia na maafsa usalama wa Tanzania nusura wazichape, msafara wasimama kwa muda, matangazo yakatwa

    Msafara wa Rais wa Liberia umesimama kwa muda baada ya kutokea purukushani wakati anaingia getini JNICC. Sintofahamu hiyo imetokea au imeletwa na wanausalama wa Tz walipokuwa wanamzuia kuingia ndani yule mpambe wa Rais anayebeba kibegi. Imebidi matangazo yakatwe kwa muda
    • Nsoji go Nvaa
    • Thread
    • liberia mda msafara nusura rais rais wa liberia usalama walinzi walinzi wa rais
    • Replies: 77
    • Forum: Jukwaa la Siasa
  5. 4

    PreGE2025 CHAUMMA kinaweza kwenda kuwa chama cha upinzani kikuu Tanzania muda wowote

    Andiko langu litakua fupi sana, ni imani yangu hamjambo wana JF. Husika na somo tajwa hapo juu chama cha Chauma ndani ya siku chache kinaweza kwenda kuwa chama kikuu cha upinzani . Hii itaenda kuwa kama ACT ilivyokuzwa na CUF . Nahisi ujinga unaofanywa na kundi ALFA NA OMEGA ukiongozwa na...
    • 4 7mbatizaji
    • Thread
    • chama chama cha upinzani chauma kikuu kwenda mda tanzania upinzani wowote
    • Replies: 44
    • Forum: Jukwaa la Siasa
  6. Z

    Lissu anaongoza kikao muda huu, Mbowe is real democratic!

    Mbowe akiwa Clouds fm leo amesema kuna kikao cha kamati kuu CDM kinachoongozwa na makamu m/kiti Tundu Lissu muda huu pale makao makuu CDM, Mbowe ni mwanademokrasia sana sana, anaheshimu katiba ya chama na mamlaka ya viongozi wenzake, hata kama Lissu anamsema hovyo, lakini Mbowe anaonyesha...
  7. H

    Tatizo la mafua ya muda mrefu

    Wakuu poleni nyote na majukumu ya leo, msaada naombeni Kuna ndugu yangu anamafua ya muda mrefu yapata Kama mwaka, alienda hospital akapatiwa dawa za allergy au mzio lakini Bado ,yani pua zinamziba sometimes anashindwa hata kuhema vizuri msaada wakuu nafanyaje hapa Sasa .

  8. Niko nasikiliza TBC Taifa kuna kipindi cha dini ya kiislamu, watu wanaopiga simu wanauliza maswali: Majibu ya moja ya swali ni hili

    Leo ijumaa kuna kipindi cha dini ya kiislamu, watu wanaopiga simu wanauliza maswali :- Kuna mama kapiga simu kauliza eti watu huko peponi watakua na Rangi gani, DINI gani na watakua wanaongea lugha gani? Sheikh kamjibu:- Huko peponi watu wote watakua Weupe waarabu, na wote watakua Waislamu na...

  9. 'Aslay mihogo' inawaka moto muda huu

    Moto ambao mpaka sasa chanzo chake hakijajulikana umezuka na kuteketeza Mabanda ya Muuza Mihogo maarufu katika fukwe za Coco Jijini Dar es Salaaam aitwaye Asley Mihogo.a Jeshi la zimamoto na ukoaji limefanya juhudi za kuuzima moto lakini mabanda yameisha Moto ambao mpaka sasa chanzo chake...

  10. Nimeota mganga ananiambia sina muda mrefu nitafakufa. Nini maana ya ndoto hii?

    Leo usiku wa saa 8 NIMEOTA NDOTO mtu ambae ni mganga akiniambia kuwa soon nitafariki Sababu ni kuwa watu wanaoniroga wamejua kuwa najua kuwa wanaoniroga so wanafanya juu chini wanizime mapema

  11. Mbinu ipi inafaa kuwafunga vilabu vya kiarabu vinavyopoteza mda?

    Vilabu vya kiarabu hasa North Africa vimekuwa vya hovyo sana,naweza kusema wenye mpira mzuri ni Al Ahly tu, kupaki basi sio tatizo ni mbinu ya kujilinda hasa unapozidiwa,lakini kupoteza mda kuanzia kipindi cha kwanza ni ujinga, waarabu wanapenda kujiangusha angusha hata kama...
    • Dabil
    • Thread
    • africa halisi ipi kiarabu maana mbinu mchezo mda mpira
    • Replies: 10
    • Forum: Jamii Sports
  12. G

    Walimu muda wowete kuitwa kazi

    Walimu Foeni mabegi yenu kwani Mda wowote mtaitwa (ku) zini. 🤔🤔🤔🤔🤔🤔🤔

  13. Habari wana jf kuna ujumbe nimepata kutoka google play kuusu usajili ku canceled na sijajua kama ntarudishiwa pesa na kama ntarudishiwa itachukua mda

    Msaada ndugu zangu pesa inaweza kurudi

  14. Rais Putin anatema cheche muda huu

    🇷🇺 PUTIN: OUR MISSILES CANNOT BE STOPPED "We will issue warnings to civilians and to clear the zones that will be targeted, and we will certainly do this in a transparent manner. We have no fears that this will reduce the effectiveness of these systems, because there is no way to counteract a...

  15. Mda wa mtoto kuwa shule upunguzwe

    Mda ambao mtoto anautumia kuwa shule ni mda mwingi mno. Namaanisha ni ile anaenda shule saa 11 asubuhi alafu anarudi saa 11 jioni, kuanzia Jumatatu mpaka ijumaa,. Hii inapelekea mtoto kukosa malezi bora ya mzazi na kutengeneza jamii isio na maadili mema. Au kama ni ngumu kupunguza mda wa...

  16. Mimba ya mwanamke imetokea kunipenda mimi lakini naishi kwa wasiwasi. Naombeni ushauri wenu

    Iko hivi, hapa zipo 4 apartments, yangu ipo Mwanzo kabisa. Huyu mke wa mtu alikuwa analeta mazoea na ikaribu usio na ulazima. Full kunichekea kila akiniona. Anaweza kurudi na mumewe anaweza kuniita hata usiku anasema amenimiss na jamaa anasikia kabisa. Fast forward jamaa kampiga mimba...

  17. Majina ya Walioitwa kazini - TMDA

    Wanajamvi, Hayawi hayawi sasa yamekua. Naona TAMISEMI na DAs wengine wameanza kuachia mikeka. Leo ni zamu ya Dar Es Salaam. Hongereni sana kwa mliopata. Wengine tuendelee kusubiri. NOTE: Ikitokea nafasi omba. Unaweza omba Songea ukaibukia TMDA

  18. Kulala na wanawake wa wili kwa mda mmoja nimekutana na tatizo kama hili

    Wana Jf leo nimelala na wana wake wawili kwa mda usio pishana dakika 20 Wa kwanza nilipo maliza zikapita dakika 20 akaja Mwengn lakn kila mmoja nime mwaga mara moja tu nimeshindwa kupanda round ya pili je, hizi ni dalili za upingufu wa nguvu za kiume

  19. Kutamani Pombe muda wa kazi

    Wakuu, Baada ya kugombana na bosi wangu na kumtukana, kazi ikaisha. Ghafla nikajikuta niko mtaani bila mchongo. Ili kubuy time ikawa ni kushinda baa na kupiga visungura tangu saa mbili asubuhi hadi jioni. Sasa bana nimepata kazi. Najizuia nisinywe mda wa kazi maana nimeshakuwa addicted napata...
  20. M

    Mtoto wa miezi 6.5 takriban masaa mawili analia bila kunyamanza shida inaweza kuwa nini?

    Habai wakuu mtoto gafla mda huu takriban masaa mawili na zaid analia bila kunyamanza..mama yake alikua katoka nyumbani kwenda kusalimia sehemu baada yakurudi jioni mtoto kaanza kuia bila kunyamanza. Hii inaweza kuwa shida gani?
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…