ʻO ke anakahi o ka wela ka calorie (pōkole kal). ʻO ka calorie ka nui o ka wela e pono ai e hoʻokiʻekiʻe i ka mahana o 1 gram o ka wai ma 1 C o (pololei mai 14,5 C a i 15,5 C ). ʻOkoʻa ka nui o ka wela e pono ai no nā mahana wai like ʻole . No ka nui like o ka wela, ʻo ka piʻi ʻana o ka mahana o ka wai ma 1 C ma waena o 14,5 C a me 15,5 C. ʻO ke anakahi o ka wela i hoʻohana pinepine ʻia, ʻoiai e hōʻike i ka waiwai ikehu o ka meaʻai, ʻo ia ka kilocalorie (kcal). 1 kcal = 1000 calories. ʻO kekahi inoa no 1 kcal = 1 Calorie (nui K). ʻO ke anakahi o ka wela no ka ʻōnaehana Pelekane ʻo Btu (British thermal unit). 1 Btu = ka nui o ka wela e pono ai e hoʻokiʻekiʻe i ka mahana o 1 paona o ka wai ma 1 F o (pololei mai 63 F a i 64 F ).
Pili ka wela i ka ikehu, no laila pono mākou e hoʻomaopopo i ka pilina ma waena o nā ʻāpana wela a me nā ʻāpana ikehu. Ma muli o nā hoʻokolohua i hana ʻia e Joule a me nā kānaka ʻepekema ʻē aʻe, ua ʻike ʻia he 4,186 Joules o ka hana e like me 1 calorie o ka wela.
1 kaloli = 4,186 Joules
1 kcal = 1000 calories = 4186 Joules
1 Btu = 778 ft.lb = 252 calories = 1055 Joules
(1 calorie = 4,186 Joules a me 1 kcal = 4186 ua kapa ʻia ka hoʻohana ʻana i ka wela mīkini)
Laʻana o kahi nīnau no ka hoʻohana ʻana i ka wela mechanical
1. 2 kcal (kilocalories) = ….. calorie ?
Pahana
1 kcal = 1000 kaloli
2 kcal = 2 (1000 kaloli) = 2000 kaloli
2. 4 Kalori = ….. kaloli?
Pahana
1 Kalori (K nui) = 1 kcal = 1000 kaloli
4 Kalori = 4 (1000 kaloli) = 4000 kaloli
3. 10 kaloli = ….. Joules?
Pahana
1 kaloli = 4,186 Joules
10 kaloli = 10 (4,186 Joules) = 41,86 Joules
4. 5 kcal = ….. Joules ?
Pahana
1 kcal = 1000 calories = 4186 Joules
5 kcal = 5 (4186 Joules) = 20930 Joules
5. 2000 Joules = ….. kcal ?
Pahana
4186 Joules = 1 kcal
8372 Joules = 8372 / 4186 = 2 kcal
2000 Joules = 2000 / 4186 = 0,4777 kcal
