What does hv mean in chemical reaction conditions?

Hv is the equation of photon energy under the condition of chemical reaction.

The equation of photon energy is E=hv, where h is Planck constant and v is the frequency of light. The value of Planck's constant is about: h = 6.6260693 (11) ×10 (-34) j) s, and the unit is jiao (j) s.

Photon is a quantum of light, a quantum of electromagnetic radiation, and a standard particle for transmitting electromagnetic interaction, which is denoted as γ. Its rest mass is zero, it has no charge, its energy is the product of Planck constant and electromagnetic radiation frequency, E=hv, it runs at the speed of light C in vacuum, its spin is 1, and it is a boson.

Extended data

As early as 1900, M. Planck put forward the quantum hypothesis when explaining the energy distribution of blackbody radiation. The energy exchange between matter oscillator and radiation is discontinuous, and there is one each, and their respective energy is H ν;

1905, Albert Einstein further proposed that light wave itself is not continuous but particle-like, which Einstein called light quantum; 1923a.h. Compton successfully explained the Compton effect of wavelength change when X-rays were scattered by matter with the concept of optical quantum, so the concept of optical quantum was widely accepted and applied, and was officially named photon in 1926.

Photons consist of positively charged particles and negatively charged particles of the same size. The distance between the center of positively charged particles and the center of negatively charged particles is the radius of photons. The diameter of positively charged particles is equal to the diameter of negatively charged particles, and the mass of positively charged particles is equal to the mass of negatively charged particles.

Photons are rotating electric dipoles moving at the speed of light, and the direction of rotation axis is perpendicular to the direction of light movement. Emit photons at the place where the centripetal force of electron motion is the largest, that is, the emission direction, the force direction and the rotation axis direction are perpendicular to each other.

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