Nau'in zafi shine kalori (wanda aka taƙaita kal). kalori shine adadin zafi da ake buƙata don ɗaga zafin gram 1 na ruwa da 1 C ( daidai daga 14,5 o C zuwa 15,5 o C). Adadin zafi da ake buƙata ya bambanta ga yanayin zafi daban-daban na ruwa . Don irin wannan adadin zafi, ƙaruwar zafin ruwa na 1 C yana faruwa ne kawai tsakanin 14,5 o C da 15,5 o C. Nau'in zafi da ake amfani da shi akai-akai, musamman don bayyana ƙimar kuzarin abinci, shine kilocalories (kcal). 1 kcal = kalori 1000. Wani suna na 1 kcal = kalori 1 (babban K). Nau'in zafi na tsarin Burtaniya shine Btu (naúrar zafi ta Burtaniya). 1 Btu = adadin zafi da ake buƙata don ɗaga zafin fam 1 na ruwa da 1 F ( daidai daga 63 o F zuwa 64 o F).
Zafi yana da alaƙa da makamashi, don haka muna buƙatar fahimtar alaƙar da ke tsakanin na'urorin zafi da na'urorin makamashi. Dangane da gwaje-gwajen da Joule da sauran masana kimiyya suka gudanar, an gano cewa Joules 4,186 na aiki daidai yake da kalori 1 na zafi.
Kalori 1 = Joules 4,186
1 kcal = kalori 1000 = Joules 4186
1 Btu = 778 ft.lb = 252 kalori = 1055 Joules
(Kalori 1 = 4,186 Joules kuma 1 kcal = 4186 ana kiransa zafi na inji)
Misali na tambayar wutar lantarki ta injina
1. 2 kcal (kilocalories) = ….. kalori?
Tattaunawa
1 kcal = kalori 1000
2 kcal = 2 (kalori 1000) = kalori 2000
2. Kalori 4 = ….. kalori?
Tattaunawa
Kalori 1 (babban adadin K) = kcal 1 = kalori 1000
Kalori 4 = 4 (kalori 1000) = kalori 4000
3. Kalori 10 = ….. Joules?
Tattaunawa
Kalori 1 = Joules 4,186
Kalori 10 = 10 (4,186 Joules) = Joules 41,86
4. 5 kcal = ….. Jimilla?
Tattaunawa
1 kcal = kalori 1000 = Joules 4186
5 kcal = 5 (4186 Joules) = 20930 Joules
5. Jimillar 2000 = ….. kcal ?
Tattaunawa
4186 Joules = 1 kcal
Jimillar 8372 = 8372 / 4186 = 2 kcal
Jimillar 2000 = 2000 / 4186 = 0,4777 kcal
