The melting point of a solid is the temperature at which it changes state from solid to liquid. When considered as the temperature of the reverse change, the temperature is referred to as the freezing point. For example, the melting point of mercury (element) is 234.32 Kelvin (-37.89 °F)
... passed on to ferredoxin, and then to an enzyme called NADP+ reductase[?] which uses them to drive the reaction
NADP+ + H+ + 2e- → NADPH
This consumes the H+ ions ...