Substances undergo sublimation or deposition based on their vapor pressure and temperature conditions. If the vapor pressure of the solid exceeds that of the liquid phase at a given temperature, sublimation occurs; if the vapor pressure of the gas decreases below that of the solid phase, deposition occurs.
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Substances undergo sublimation when they transition directly from the solid phase to the gas phase or deposition when they transition from gas to solid without passing through the liquid phase. These processes occur due to changes in temperature and pressure, which alter the equilibrium between the different phases of matter.