The pressure under which liquid and vapor can co-exit at equilibrium is called the __________ vapor pressure.

ANS:C - saturated

The pressure under which liquid and vapor can coexist at equilibrium is called the saturated vapor pressure. Saturated vapor pressure is a characteristic property of a substance at a given temperature. It represents the pressure exerted by the vapor phase when the liquid phase is in equilibrium with it at a specific temperature. At this pressure, the rates of evaporation and condensation of the substance are equal. Saturated vapor pressure is dependent solely on the temperature and the nature of the substance, not on the presence of other gases or the total pressure of the system. So, the correct term is saturated vapor pressure.