The amount of heat energy needed to raise 1 gram of water from 14.5C to 15.5C is called a(n) Microbiology The amount of heat energy needed to raise 1 gram of water from 14.5C to 15.5C is called a(n) A. joule. B. calorie. C. erg. D. thermal unit. Answer: B Share this Share on FacebookTweet on TwitterPlus on Google+