VAVI - VAVI Sports equipment sublimated

Sublimation is the process of transformation

directly from the solid phase to the gas phase

without passing through an intermediate liquid

phase. Sublimation is an exothermic phase

transition that occurs at temperatures and

pressures below a substance's triple point in its

phase diagram.

At normal pressures, most chemical compounds and elements possess three different states at different

temperatures. In these cases, the transition from the solid to the gaseous state requires an intermediate

liquid state. Note, however, that the pressure referred to here is the partial pressure of the substance, not the

total (e.g., atmospheric) pressure of the entire system. So, all solids that possess an appreciable vapor

pressure at a certain temperature usually can sublime in air (e.g., water ice just below 0°C). For some

substances, such as carbon and arsenical, sublimation is much easier than evaporation from the melt,

because the pressure of their triple point is very high, and it is difficult to obtain them as liquids.

Sublimation requires additional energy and is an endothermic change. The enthalpy of sublimation (also

called heat of sublimation) can be calculated as the enthalpy of fusion plus the enthalpy of vaporization. The

reverse process of sublimation is deposition. The formation of frost is an example of meteorological

deposition.