. The diagram represents a weather balloon as it rises from Earth's surface to 1000 meters (m). The air temperature and wet-bulb temperature values in degrees Celsius (°C) and the air pressure
values in millibars (mb) are given for three altitudes.
air pressure = 994 mb
air temperature = 12°C
wet-bulb temperature = 12°C
- 1,000
air pressure = 1004 mb
air temperature = 17°C
wet-bulb temperature = 13°C
Altitude (m)
500
air pressure = 1014 mb
air temperature = 22°C
wet-bulb temperature = 14°C
0 (Earth's surface)
(Not drawn to scale)
A cloud is forming at 1000 meters. Identify the phase change that is occurring at 1000 meters to
produce the cloud.