When sulfur dioxide reacts with water droplets in the air, it forms a substance that falls back to earth as

When sulfur dioxide reacts with water droplets in the air, it forms a substance that falls back to Earth as sulfurous acid.

The equation that rules the transformation is:

SO2 + H2O ---> H2SO3

Sulfurous acid can undergoes further transformation and form sulfuric acid which is what cause the acid rain.

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.

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