Internal Energy

Internal energy, abbreviated as U, is the total of all energies associated with the motion of the molecules in the system.

 

Internal energy formula

\(\large{ U =  \frac {3}{2} \; n \; R \; T_a }\)

Where:

Units	English	Metric
\(\large{ U }\) = internal energy	\(\large{Btu}\)	\(\large{J}\)
\(\large{ T_a }\) = absolute temperature	\(\large{ R }\)	\(\large{ K }\)
\(\large{ R }\) = ideal gas constant	\(\large{ \frac{lbf-ft}{lbmol-R} }\)	\(\large{ \frac{J}{kmol-K} }\)
\(\large{ n }\) = number of moles	\(\large{dimensionless}\)