Kuyini imitha?

Kunengqondo ukuphetha ngokuthi kukhona yini okungazuzisa silula kunaleso isenzo iyunithi, ngawo wonke umuntu ubhekene ngokoqobo kusukela ezalwa. Imitha, kilogram, ilitha ... Nokho, ngezinye izikhathi ukuphila ubeka imibuzo emisha ngisho nangaphambi lezi "gurus". Omunye izibonelo ezinjalo - siyini lesi imitha. Ngempela, izifundo esikoleni geometry amayunithi kwanoma iyiphi ezidlula kungukuthi kulinganiswa. Ngakho, kungenzeka ukuthi abekho, njengoba ukwenza amamitha ukugijima - eqanjiwe okumsulwa? Manje i-Internet utholwa yibo bonke, ngemcondvo, ungakwazi ukuthola kalula impendulo cishe noma yimuphi umbuzo. Into esemqoka - kuba enelungelo ke. Sokwazi ngokuthayipha kubha yokusesha ye isicelo isiphequluli "ukuthi imitha kuyinto" Ngokuqinisekile bamangale yokuthi la mazwi ehlangana ekhishini indaba ephathwayo. Kusho ukuthini lokhu?

ejwayelekile

Mhlawumbe, phela kufanele ukuphenya umbuzo ukuthi imitha kahle. Kusobala ukuthi njengoba sikhuluma amayunithi angakahleleki, search for impendulo kufanele ibe eFrance, ngo-Bureau of izilinganiso okuyinto igcina zonke amasampula inkomba SI. Kodwa uma besingase sikwazi ukubheka zezitsha, khona-ke alikho imitha wasenganekwaneni komugqa kukhona ayitholakali. Lokhu kubonisa ukuthi imitha samanje esilinganisweni edingekayo ubude is ngokungaqondile kuphela ezihlobene.

Ekuqaleni, omunye eziyishumi-ingxenye isikhathi meridians eliwumhlaba, intersecting Paris sathathwa njengendlela reference. izinyathelo ezidingekayo ukusebenza ngo 1795, futhi emva kusungulwa anezele zokulungisa e 1799, esekelwe umugqa idatha eyenziwe engagqwali usayizi-platinum. Ngemva kwalokho, Nokho, ukunemba amamitha enjalo ngokwethukela wangabaza, kusukela ukuma izwe ikude indilinga ephelele, kodwa futhi geodesy classical ukuthola ukunemba okunjalo engakaze ibonwe ngaphandle satellite imethrikhi cishe kungenakwenzeka. Uma ngesikhathi original "ejwayelekile" ukunemba yakhe kwaba ngempela ukwanele yonke imisebenzi ye isikhathi, isimo lalishintsha njalo ngonyaka. Ngenxa yalokho, ngo-1960, kwahlongozwa ukuyisebenzisa njenge-imitha ingxenye ethile ka nombono yoguquko-athomu e Krypton. Futhi eminyakeni engu-23 nje ngemva kokwamukela esezingeni nencazelo yabo yesimanje, kuboshelwe ubude indlela ugongolo ukukhanya esikhaleni nje.

Kuyini imitha?

Leligama lisetshenziswa ikakhulukazi ukudayiswa izinto iphuma. Ngenxa yakhe ayikwazanga kakhulu lula izibalo. Ngokwesibonelo, umuntu udinga ukuthenga 10 metres square linoleum. Amashibhi impahla esebenzayo yaqaphela imiqulu, ububanzi okuyinto EsiZulwini asinayo ngemodeli ngayinye. Ngakho, ukuze uthole edingekayo 10 sq. m 2 m roll ububanzi, kubalulekile ukukala 5 kuphela m. Njengoba 2 m * 5 m = 10 sq. M. Nazi 5 - futhi ube imitha. Ngamanye amazwi, lo imitha ilingana nenani inkomba, kodwa umbono akubaluleke ngalutho eminye njalo (kulesi simo ububanzi).

Nokho, le ncazelo kudinga ukuchazwa, njengoba njalo inkulumo ethi "imitha komugqa ekhishini," akucaci ngaso sonke isikhathi. Phela, by Isifaniso, ngokuthenga kwe ekhishini ifenisha, kwakuthiwa, angacelwa sokuphumula kusuka roll inombolo ethile amakhabethe. kuvela isiphithiphithi esivela yokuthi abathengisi imikhiqizo enjalo ifenisha kushiwo ngaphambili amagugu njalo ezibhekwa hhayi wonke, futhi izindleko impahla kanye nabasebenzi. Uma siyazi intengo imitha, futhi ngayinye elandelayo kuhluke kuphela ekucushweni ngekwendzawo (ngenkathi sigcina esilinganayo impahla), kungaba lula kakhulu ukusebenzisa umqondo izibalo eseduze imitha ngalinye. Abathengi abanesifiso izindleko "ikhishi modeli, kodwa ubude elikhulu noma elincane," kalula ukubala, ngisho bebodwa.