1焦耳= 0.23889999999997卡
1卡= 4.185851820846焦耳
1大卡=1千卡
1吉焦=1000MJ=1000000000J=1000000千焦
=1000000*0.23889999千卡=238900千卡=238900大卡一千克煤=5500大卡