Erasto B. Mpemba

Erasto Bartholomeo Mpemba, (1950–2023)http://www.trtafrika.com/lifestyle/mpemba-the-man-who-froze-hot-water-faster-than-cold-water-13439436 ɗan wasan Tanzaniya ne wanda, a matsayin ɗan makaranta, ya gano tasirin mai suna Mpemba, wani abu mai ban mamaki wanda ruwan zafi ke daskarewa fiye da ruwan sanyi a ƙarƙashin wasu yanayi; Aristotle, Francis Bacon, da René Descartes sun lura da wannan tasirin a baya.
Ya gano lamarin ne a makarantar Sakandare ta Magamba a shekarar 1963 a lokacin da yake shirya ice cream domin samun kudin aljihu.  Saboda rashin lokaci, ya tsallake lokacin sanyaya lokacin shirya ice cream kuma nan da nan ya sanya shi a cikin injin daskarewa; ba zato ba tsammani, madarar tasa ta daskare fiye da na abokan karatunsa.https://www.quantamagazine.org/does-hot-water-freeze-faster-than-cold-physicists-keep-asking-20220629/  Malamin ilimin kimiyyar lissafi a lokacin ya gaya masa cewa abin da ya gani ba zai yiwu ba a fili.  Bayan 'yan shekaru, shugaban makarantar Mpemba ya gayyaci masanin kimiyyar lissafi dan kasar Burtaniya Denis Osborne (1932-2014) daga Jami'ar Dar es Salaam don ya ba da lacca kan aikinsa.  A ƙarshen gabatarwa, Mpemba ya yi tambayar da ta daɗe yana damun shi: “Idan ka ɗauki beaker guda biyu tare da ruwa daidai gwargwado, ɗaya a 35 ° C, ɗayan kuma a 100 ° C, sa'annan ka saka su a cikin tukunyar ruwa. firiji, wanda ya fara a 100 ° C ya fara daskarewa. Me yasa?”  Malamai da abokan karatunsu a wurin sun yi tunanin cewa da'awar ba ta da kyau kuma sun yi wa Mpemba ba'a game da tambayar. Hakanan an kama Osborne, amma daga baya ya sami damar tabbatar da gwaji a matsayin sahihancin abin da Mpemba ya gani.   A cikin 1969, a lokacin karatun Mpemba a Kwalejin Gudanar da Namun daji na Afirka kusa da Moshi, an buga takarda da shi da Osborne suka rubuta akan lamarin. https://www.spektrum.de/magazin/inverser-mpemba-effekt/1752466

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Category:Haifaffun 1950
Category:Mutuwan 2023