Amayunithi atholakele

Ngenkathi amayunithi wokulinganisa ubukhulu obusungulwe ukucacisa ubukhulu bezinto ezingenakulinganiswa kusukela 'kubalo lwamayunithi ngamanye' alula, Amayunithi atholakalayo yilawo asuselwa kumayunithi wokulinganisa, futhi asetshenziselwa amanani athe xaxa.

Iyunithi yokukala ubude (imitha), eyodwa yobunzima (ikhilogremu), isikhathi esisodwa (owesibili), enye yamandla kagesi (i-ampere), enye yezinga lokushisa (i-kelvin), enye yobungako bezinto ( imvukuzane), nokukhanya okukhulu (candela). Kusuka kulezi eziyisikhombisa kungenzeka ukwenza inhlanganisela egcina ifinyelele kunoma yimaphi amayunithi atholakele, adingekayo ukukalwa kwesinye isigaba semicimbi. Yize kungewona amayunithi ayisisekelo, kusengamandla amakhulu kakhulu esintwini: Ngaphandle kwamayunithi atholakele, isilinganiso samandla, amandla, ingcindezi, amandla, isivinini noma ukusheshisa bekungeke kwenzeke.

Njengamayunithi wokulinganisa ajwayelekile, amayunithi atholakalayo nawo anika amandla okwenza ukuguqulwa phakathi kwezinhlobo ezahlukahlukene. Isibonelo, kuvamile ukuthi iyunithi yesilinganiso 'iNewton' isetshenziselwe ukukala ubukhulu bamandla, kepha kukhona neyunithi yesilinganiso 'uDina', ngaphansi kobudlelwano lapho i-newton eyodwa ilingana namakhosi ayi-100,000. Kwenzeka into efanayo ngokulinganisa kwamandla, umsebenzi nokushisa: Ama-Joules asetshenziswa emkhakheni wesayensi, kepha ama-calories asetshenziswa empilweni yansuku zonke. Ubudlelwano buqondile, ngokwenani lekhalori elingu-4.181 joules.

Uhlu olulandelayo luqukethe izibonelo eziyishumi nanhlanu zamayunithi atholakele, okugqamisa ukuthi zimeleni, kanye nenhlanganisela yamayunithi ayisisekelo esilinganiso anqumayo.

1. Imitha ngomzuzwana (isilinganiso sejubane noma isivinini): Imitha / Okwesibili
2. Imitha yeCubic (isilinganiso sevolumu): imitha³
3. UPascal (ingcindezi yokukala): Kilogram / (Imitha * Okwesibili²)
4. UHenry (inductance measurement): (Ikhilogre * Ampere² * Isitimela²) / Okwesibili²
5. Imitha ngesekhondi ngalinye (isilinganiso sokusheshisa): Imitha / Okwesibili²
6. Hertz (isilinganiso semvamisa): 1 / Okwesibili
7. I-pascal yesibili (isilinganiso se-viscosity enamandla): Ikhilogremu ((Imitha * * yesibili)
8. Ikhilogremu ngemitha ngalinye elilodwa (ubukhulu besilinganiso): Ikhilogremu / Imitha³
9. Isikwele imitha (isilinganiso sendawo): Imitha²
10. Volt (isilinganiso samandla kagesi): (imitha² * Kilogram) / (Ampere * Okwesibili³)
11. Imitha yaseNewton (isilinganiso somzuzu wamandla): (Meter² * Ikhilogremu / Okwesibili²
12. I-Joule ngemitha ngalinye lama-cubic (isilinganiso samandla kagesi): Amakhilogremu / (Imitha * Okwesibili²)
13. Coulomb (isilinganiso sokushaja kagesi): Ampere * Okwesibili
14. Imole nge-cubic meter ngayinye (isilinganiso sokuhlushwa): Mol / Meter³
15. I-Watt (isilinganiso samandla): (meter² * Ikhilogremu / Okwesibili³