Total energy.
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Kenetic energy
You can't, temperature is the average kenetic energy of the molecules and in space, there simply are too few or none to measure.
Total energy.
Hydraulic grade line is sum of Datum + Pressure Head Energy grade line is sum of Datum + Pressure Head + Velocity Head
There is no sum of e=mc2, it is an equation concerning matter and energy. e=mc2 stands for: Energy equals mass times the velocity of light squared. E = M C 2