Chapter 7 - Adiabatics and Stability

Which of the following statements is correct (P.89)?

• Air is cooled by compression

• Air is heated by expansion

• An adiabatic temperature change occurs when a gas is compressed or expanded with external exchange of heat

• Air is cooled by expansion

The Dry Adiabatic Lapse Rate (DALR) has a constant value of (P.89):

• 2^oC/1000 feet

• 1^oC/100 feet

• 3^oC/1000 feet

• 0.65^oC/100 m

Saturated air, when forced to rise (P.89):

• will be heated

• will be cooled

• will freeze

• will be unaffected by temperature change

The amount of water vapour the air can hold is (P.90):

• inversely proportional to temperature

• directly proportional to pressure

• inversely proportional to humidity

• directly proportional to temperature

Which of the following statements is correct (P.90)?

• At high temperature the air can hold a small amount of water vapour

• At high temperature the air can hold a large amount of water vapour

• When saturated air rises, it heats up therefore slowing down the cooling process

• When saturated air rises, water vapour freezes

If the Environmental Lapse Rate is 4^oC / 1000 feet (P.91):

• the air will be absolutely unstable

• the air will be very stable

• the air will be conditionally stable

• the air will be stable at first then become unstable

Which of the following weather condition is typical for stable weather (P.95)?

• Cumuliform clouds

• Heavy rain

• Severe turbulence

• Stratiform clouds

The type of clouds that can be seen in stable weather is (P.95):

• Nimbostratus

• Cumulonimbus

• Altocumulus

• Stratus

When ELR > DALR, we can see (P.96):

• Light turbulence

• Moderate to poor visibility

• Light rain

• Moderate to heavy showers

The clouds which form in unstable air are usually (P.96):

• large in vertical extend

• large in horizontal extend

• very thin layers

• ice particles