The quantity of heat necessary to raise the temperature of 1 lb of water by 1 °F
1 BTU = 1066 J
The quantity of heat necessary to raise the temperature of 1 g of water by 1 °C
1 cal = 4.187 J
Unit of energy used to indicate the amount of energy in foods
1 Cal = 1 kcal = 1 cal
Standard energy unit in SI system
1 J = 1 kg (m^2/s^2)
Energy unit typically used for electricity
1 kWh = 1 W * 3600 s = 1000 J/s * 3600 s = 3,600,000 J
Unit on which natural gas is sold in USA
1 Therm = 100 standard cubic feet of natural gas
Mechanical energy in imperial unit system equal to the energy required to raise a one pound object one foot
Potential energy = m g z
1,000,000,000,000,000 BTUs
1 QUAD ~ 1 EJ: USA uses ~100 QUAD/yr
1,000,000,000,000,000,000 Joules
1 EJ ~ 1 QUAD: USA uses ~ 100 EJ/yr
The amount of energy required to move an electron through a 1 volt potential difference
1 eV = 1.602x10^-19 J
Atomic Unit of Energy
1 Eh = 4.359x10^-18 J
Energy unit in cgs (grams, centimeters, seconds) system
1 erg = 10^-7 J
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