1. The problem statement, all variables and given/known data "The use of the British thermal unit (Btu) is common in much engineering work. A Btu is the amount of heat required to raise the temperature of 1 lb of water by 1°F. Calculate the number of joules in a Btu. 2. Relevant equations "A calorie was originally defined as the amount of energy required to raise the temperature of 1 g of water from 14.5°C to 15.5°C. A calorie is now defined in terms of the joule: 1 calorie = 4.184 J" 3. The attempt at a solution I know one BTU is 1054 J. Here is what I believe to be correct: 1-lb(453.59 g/lb)(4.148-J/1°C)(5/9°F/1°C) = 1054 J However, I'm a bit worried about my last factor. Isn't it supposed to be (5/9(°F - 32°)/1°C)?