In a rising thermal,the dew-point temperature
A) increases at a slower rate than the parcel temperature.
B) decreases at the same rate as the parcel temperature.
C) decreases at a slower rate than the parcel temperature.
D) increases at a faster rate than the parcel temperature.

Question

Quizplus · Accepted Answer

As a parcel of air rises, it cools down at a rate of approximately 10°C per 1000 meters due to adiabatic cooling. If the temperature of the parcel reaches the dew point temperature, the moisture in the air condenses out as visible moisture like fog or clouds. Dew point temperature decreases with height, but it decreases at a slower rate than the parcel temperature. Therefore, as a rising parcel of air cools, it will eventually reach a point where the temperature equals the dew point temperature. However, as the parcel continues to rise and cool, the temperature will decrease faster than the dew point temperature, causing more condensation and the formation of clouds.

In a Rising Thermal,the Dew-Point Temperature