Iyunithi yokushisa yikhalori (efingqiwe ngokuthi i-kal). Ikhalori inani lokushisa elidingekayo ukuphakamisa izinga lokushisa legremu eli-1 lamanzi nge-1 C₂ ( kusukela ku-14,5 o C kuya ku-15,5 o C). Inani lokushisa elidingekayo liyahlukahluka emazingeni okushisa ahlukene amanzi . Ngenani elifanayo lokushisa, ukwanda kwe-1 C₂ kokushisa kwamanzi kwenzeka kuphela phakathi kuka-14,5 o C no-15,5 o C. Iyunithi yokushisa evame ukusetshenziswa, ikakhulukazi ukuveza inani lamandla okudla, yi-kilocalorie (kcal). 1 kcal = amakhalori ayi-1000. Elinye igama le-1 kcal = 1 Calorie (inhloko-dolobha K). Iyunithi yokushisa yesistimu yaseBrithani yi-Btu (iyunithi yokushisa yaseBrithani). 1 Btu = inani lokushisa elidingekayo ukuphakamisa izinga lokushisa lephawundi eli-1 lamanzi nge-1 F₂ ( kusukela ku-63 o F kuya ku-64 o F).
Ukushisa kuhlobene namandla, ngakho-ke sidinga ukuqonda ubudlelwano phakathi kwamayunithi okushisa namayunithi wamandla. Ngokusekelwe ekuhlolweni okwenziwe nguJoule nabanye ososayensi, kutholakale ukuthi amaJoules angu-4,186 omsebenzi alingana nekhalori elilodwa lokushisa.
Ikhalori eli-1 = ama-Joules angu-4,186
1 kcal = amakhalori ayi-1000 = ama-Joules angu-4186
I-Btu eyi-1 = 778 ft.lb = amakhalori angama-252 = ama-Joules ayi-1055
(Ikhalori eli-1 = ama-Joules angu-4,186 kanye ne-kcal eli-1 = 4186 libizwa ngokuthi umshini wokushisa womshini)
Isibonelo sombuzo wokushisa komshini
1. 2 kcal (ama-kilocalories) = ….. ama-calories ?
Ingxoxo
1 kcal = amakhalori ayi-1000
2 kcal = 2 (amakhalori ayi-1000) = amakhalori ayi-2000
2. Amakhalori ama-4 = ….. amakhalori?
Ingxoxo
Ikhalori eli-1 (inhloko-dolobha i-K) = 1 kcal = amakhalori ayi-1000
Amakhalori ama-4 = 4 (amakhalori ayi-1000) = amakhalori angu-4000
3. Amakhalori ayi-10 = ….. AmaJoule?
Ingxoxo
Ikhalori eli-1 = ama-Joules angu-4,186
Amakhalori ayi-10 = 10 (4,186 Joules) = 41,86 Joules
4. 5 kcal = ….. AmaJowule?
Ingxoxo
1 kcal = amakhalori ayi-1000 = ama-Joules angu-4186
5 kcal = 5 (4186 Joules) = 20930 Joules
5. AmaJowule angu-2000 = ….. kcal ?
Ingxoxo
AmaJowule angu-4186 = 1 kcal
AmaJowule angu-8372 = 8372 / 4186 = 2 kcal
AmaJowule angu-2000 = 2000 / 4186 = 0,4777 kcal
