WorksheetsCPL met chapter 6 Stability of Air
Total questions: 27
Worksheet time: 7hrs 45mins
Stable air will have
fair to poor visibility
cloud if present layer type (stratiform)
Precipitation in the form of rain or drizzle
Turbulence
Good visibility
Unstable air will be associated with which conditions
Heap type cloud (Cumuliform)
Up and down currents (Turbulence)
Showers heavy at times with occasional thunderstorms
Outside of cloud visibility will be good
Poor visibility
Neutrally stable air ressembles condtions found in
Stable air
Unstable air
Stability is when
Air that has been disturbed returns to its original positions without an external force being applied
Air that has been disturbed returns to its original positions or wants to return to its original position without an external force being applied
Air that has been disturbed moves away and comes to rest at a new area without an outside force being applied
Air that has been disturbed and continues to moves away without an outside force being applied
Unstable air is when, after a disturbance air continues to move _____ from its _______ position
(a)
Neutrally stable air is when, after a disturbance it retains a new _______ without any tendency to return to its ______ position
(a)
Stability of air is determined by
Temperature lapse rate of the environment (ELR)
The (adiabatic) change in temperature of a vertically moving parcel of air (DALR or SALR)
Pressure lapse rate of the environment (PLR)
The change in temperature of a vertically moving parcel of air
A parcel of air is just a (a) of air
The ISA temperature lapse rate is
1.98°C/1000 ft or 2°C/1000ft
4.56°C/1000 ft or 4°C/1000ft
3.20°C/1000 ft or 3°C/1000ft
1.52°C/1000 ft or 1.5°C/1000ft
The temperature lapse rate that applies at a given locality is known as the ________ (or observed) lapse rate abbreviated to ____
(a)
Which curve is steep
A
B
D
E
which curve is shallow
E
A
B
C
Which curve has an isothermal layer
B
C
D
E
Which curve has an inversion layer
C
D
A
E
ELR is plotted against (a)
An adiabatic process is when __ heat energy is _____ or lost to the __________
(a)
An isobaric process is when when ___________ changes and _________ remains constant
(a)
the DALR is (a) °/1000
When the DALR is greater than the ELR, dry air is
Stable
Unstable
Neutrally stable
When the DALR is less than the ELR, dry air is
Unstable
Stable
Neutrally stable
When the ALR is greater than the ELR it means the (a) lapse rate is greater than the ELR
When the SALR is greater than the ELR, saturated air is
Stable
Unstable
Neutrally stable
When the SALR is less than the ELR, saturated air is
Unstable
Stable
Neutrally stable
Absolute stability occurs when the ELR is less than (a) °C/1000
Absolute instability occurs when the ELR is more than (a) °C/1000
Stability of air depends on the
ELR and state of air (dry or wet)
ELR
state of air (dry or wet)
Temperature lapse rate
A super adiabatic lapse rate occurs when the ELR is an excess of (a) °/1000ft
