At sea level, an air parcel at 20°C has a relative humidity of 50%. As the unsaturated air parcel rises 1 km up a mountain, the air cools to a temperature of 10°C and becomes completely saturated. The air parcel continues to climb to the top of the mountain—an elevation of 2 km. What were the air’s capacity and the humidity at sea level? What was the dew point temperature at an elevation of 1 km? What was the air temperature at the top of the mountain (elevation 2 km)?