1,000Jは何calですか？
1,000J = 239.006cal
239.006calなので239calと言っても差し支えありません — 誤差は0.5%以内です。
逆に1,000calは何Jですか？
1,000cal = 4,184J
計算式: cal = J × 0.239006
J → cal 前後の値
100 J23.901cal
200 J47.801cal
300 J71.702cal
400 J95.602cal
500 J119.503cal
600 J143.403cal
700 J167.304cal
800 J191.205cal
900 J215.105cal
1,000 J239.006cal
1,100 J262.906cal
1,200 J286.807cal
1,300 J310.707cal
1,400 J334.608cal
1,500 J358.509cal
1,600 J382.409cal
1,700 J406.31cal
1,800 J430.21cal
1,900 J454.111cal
2,000 J478.011cal