Concept:When the wet bulb and dry bulb temperatures are equal, evaporation cannot take place, meaning the air holds all the moisture it can.Explanation:The dry bulb thermometer measures the actual air temperature.The wet bulb thermometer is cooled by evaporation of water from its cloth.If the air is saturated, no more water can evaporate, so there is no cooling.Therefore, the wet bulb and dry bulb readings will be the same.Answer:The air is saturated.