E stands for energy, and the unit is J (reading: Coke).

H is Planck constant h = 6.6260755 (40) ×10 (-34th power) j.s (focal second).

V is the frequency unit Hz (hertz) and -s (per second).

Measurement of basic unit motion cycle range of space energy matter. Modern physics has defined the quantitative relationship between mass and energy, that is, Einstein's mass-energy relationship: E=MC? .

Extended data

"Energy" exists in many forms in nature. According to the law of conservation of energy, energy can be transformed from one form to another. For the convenience of calculation, all forms of "energy" need a unified unit, namely Joule (J) or Cal.

For many years, the unit of energy used in nutrition has been called calorie or kilocalorie. 1Kc refers to the energy required for the temperature of 1Kg pure water to rise from 15℃ to 16℃. The international unit of energy is Joule (J). 1J refers to the energy required to move an object with a force of 1 Newton (n). 1000 kj = 1× 106j .

The conversion of the two energy units is as follows:

1KJ= 1000J， 1000 kj = 1× 106j

1Kc=4. 184KJ， 1KJ=0.239Kc

1000Kc=4. 184MJ， 1MJ=239Kc

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