Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?

ANS:D - dew point temperature

The dew point temperature is the temperature at which air becomes saturated with water vapor, leading to the condensation of water vapor into liquid water, typically forming dew. It represents the point at which the air's moisture content is at its maximum for a given temperature and pressure. When the air is cooled at constant pressure, it eventually reaches a temperature at which it can no longer hold all of its moisture vapor, leading to condensation. This temperature is known as the dew point temperature. At the dew point, the relative humidity of the air is 100%. The dew point temperature is an important parameter in weather forecasting, as it indicates when moisture in the air will condense into water droplets, potentially leading to fog, dew, or frost formation. It is also relevant in various industrial processes, such as in the design and operation of air conditioning systems, where controlling humidity levels is essential.