.

Why do we need

...............It makes absolutely No Sense

Scale is no excuse - there are

.

Why do we need

**12 Units of Energy**?**When the SI Unit of Energy Joule should be the universal standard.**...............It makes absolutely No Sense

Scale is no excuse - there are

**20 SI prefixes**from 10^{-24}to 10^{24}**1 electronvolt = 0.1602176565 aJ**

the ground state energy of H = 2.179872172216155945 aJthe ground state energy of H = 2.179872172216155945 aJ

**so, what is the problem with expressing energy strictly in Joule**

on every level - from atomic physics to cheese biscuits (?)on every level - from atomic physics to cheese biscuits (?)

**depending on the day of the week**

Joule.............................. J

electronvolt................... eV = 1.602176565 × 10

Hartree................. ....... Eh = 4.35974434 × 10

Planck energy................ Ep = 1.956 × 10

Rydberg........................ Ry = 13.60569253 eV = 2.179872172216155945 x 10

kilowatt-hour.............. kWh = 3.6 x 10

British Thermal Unit.......Btu = 1055 - 1060 JJoule.............................. J

electronvolt................... eV = 1.602176565 × 10

^{−19}JHartree................. ....... Eh = 4.35974434 × 10

^{−18}JPlanck energy................ Ep = 1.956 × 10

^{9}JRydberg........................ Ry = 13.60569253 eV = 2.179872172216155945 x 10

^{-18}Jkilowatt-hour.............. kWh = 3.6 x 10

^{6}JBritish Thermal Unit.......Btu = 1055 - 1060 J

**depending on the day of the week**

therm......................... thm = 1.05506000 x 10

calorie.......................... cal = 4.184 - 4.204 Jtherm......................... thm = 1.05506000 x 10

^{8}Jcalorie.......................... cal = 4.184 - 4.204 J

reciprocal centimetre..cm

TNT equivalent (tonne)..... t = 4.184 × 10

horsepower-hour..........hph = 2.6477955 x 10reciprocal centimetre..cm

^{-1}= 11.96266 JTNT equivalent (tonne)..... t = 4.184 × 10

^{9}Jhorsepower-hour..........hph = 2.6477955 x 10

^{6}J.

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