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Energy
Unit Name Symbol SI Equivalent 
· a.u. of energy 
Eh  4.35975x10-18 J 
· barrel oil equivalent 
bboe  6.12x109 J 
· bboe (barrel oil equivalent) 
bboe  6.12x109 J 
· BeV (billion eV) 
BeV  1.60218x10-10 J 
· British thermal unit (ISO) 
Btu (ISO)  1055.06 J 
· British thermal unit (IT) 
Btu (IT)  1055.06 J 
· British thermal unit (mean) 
Btu (mean)  1055.87 J 
· British thermal unit (thermochemical) 
Btu (therm.)  1054.35 J 
· calorie (15°C) 
cal15  4.185 J 
· calorie (4°C) 
cal4  4.2045 J 
· Calorie (diet kilocalorie) 
Cal, kcal  4180 J 
· calorie (IT) (International Steam Table) 
cal (IT)  4.18674 J 
· calorie (mean) 
calmean  4.19002 J 
· calorie (thermochemical) 
cal (therm.)  4.184 J 
· Celsius-heat unit 
Chu  1899.18 J 
· coulomb volt 
C-V  1 J 
· cubic centimeter-atm 
cm3-atm  0.101325 J 
· cubic foot atm 
ft3-atm  2869.2 J 
· electronvolt 
eV  1.60218x10-19 J 
· erg 
erg  1x10-7 J 
· foot-pound force 
ft-lbf  1.35582 J 
· foot-poundal 
ft-pdl  4.21401x10-2 J 
· gigaelectronvolt 
GeV  1.60218x10-10 J 
· gram calorie 
gram-cal  4.18674 J 
· hartree 
Eh  4.35975x10-18 J 
· horsepower (550ft-lbf/s)-hour 
Hp-h  2.68452x106 J 
· inch pound force 
in-lbf  0.112985 J 
· joule 
J  1 J 
· kilocalorie (15°C) 
kcal15  4185.5 J 
· kilocalorie (4°C) 
kcal4  4204.5 J 
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CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Negotiate Your Salary

Learn the best principles to negotiate the salary you deserve!

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