Energy – Just Facts
Two common measures of energy are British thermal units Btu and joules All forms of energy can be expressed in these units One Btu is the amount of energy needed to raise the temperature of one pound of water from 39 to 40 degrees Frenheit One joule is the amount of energy needed to lift one hundred grams 35 ounces upward by one meter 33 feet while on the surface of the earth