Which of the following changes of state is known as sublimation in meteorology ?
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A parcel of moist but not saturated air rises due to adiabatic effects Which of the following changes ?
In which of the following changes of state is latent heat released ?
How are high level condensation trails formed that are to be found occasionally behind jet aircraft Through water vapour released during fuel combustion. it the water vapour produced when hydrocarbon fuels are burnt. 
In an air mass with no clouds surface temperature 15°c and temperature at 1000 m/agl 13°c this layer of air Through water vapour released during fuel combustion. lapse rate 2°c 1000 m (3000 ft) so 0 6°c 1000 ft we have four possibilities if environmental lapse rate (elr) more than 3°c/1000 ft (dry adiabatic lapse rate) environment unstable if environmental lapse rate (elr) is less than 1 8°c/1000 ft (saturated adiabatic lapse rate) environment stable if environmental lapse rate (elr) more than 1 8°c/1000 ft but less than 3°c/1000 ft we have conditional stability if air dry or unstability if air saturated. 
If a saturated air mass descends down a slope its temperature increases at A lower rate than in dry air as evaporation absorbs heat. relative humidity will change if moisture added to or taken from air mass or if temperature changes if temperature increases relative humidity decreases if temperature decreases relative humidity increases. 
Continuous freezing rain observed at an airfield which of four diagrams most likely to reflect temperatures above airfield concerned 297 A lower rate than in dry air as evaporation absorbs heat. there are a few basic elements that need to be in place freezing rain to occur there must be a thick layer of warm air in mid layers of atmosphere there also must be a very narrow layer of below freezing temperatures at surface the rain falling into air with a temperature below 0°c. Question 130-8
An isothermal layer a layer of air in which temperature Remains constant with height. there are a few basic elements that need to be in place freezing rain to occur there must be a thick layer of warm air in mid layers of atmosphere there also must be a very narrow layer of below freezing temperatures at surface the rain falling into air with a temperature below 0°c. Question 130-9
An inversion a layer of air which Remains constant with height. there are a few basic elements that need to be in place freezing rain to occur there must be a thick layer of warm air in mid layers of atmosphere there also must be a very narrow layer of below freezing temperatures at surface the rain falling into air with a temperature below 0°c. Question 130-10
The environmental lapse rate in an actual atmosphere Remains constant with height. there are a few basic elements that need to be in place freezing rain to occur there must be a thick layer of warm air in mid layers of atmosphere there also must be a very narrow layer of below freezing temperatures at surface the rain falling into air with a temperature below 0°c. Question 130-11
The dry adiabatic lapse rate has a value of Remains constant with height. the dry adiabatic lapse rate has a constant fixed value of 1°c/100 m (3°c/1000 ft). Question 130-12
The dry adiabatic lapse rate Has a constant fixed value. the dry adiabatic lapse rate has a constant fixed value of 1°c/100 m (3°c/1000 ft). Question 130-13
An air mass called stable when The vertical motion of rising air tends to become weaker disappears. the dry adiabatic lapse rate has a constant fixed value of 1°c/100 m (3°c/1000 ft). Question 130-14
Advection Horizontal motion of air. advection horizontal motion of air subsidence vertically downwards motion of air convection vertically upwards motion of air. Question 130-15
Subsidence Vertically downwards motion of air. advection horizontal motion of air subsidence vertically downwards motion of air convection vertically upwards motion of air. Question 130-16
Rising air cools because Vertically downwards motion of air. advection horizontal motion of air subsidence vertically downwards motion of air convection vertically upwards motion of air. Question 130-17
A layer can be Stable unsaturated air unstable saturated air. if environmental lapse rate (elr) more than 3°c/1000 ft (dry adiabatic lapse rate) environment unstable if environmental lapse rate (elr) less than 1 8°c/1000 ft (saturated adiabatic lapse rate) environment stable but if environmental lapse rate (elr) more than 1 8°c/1000 ft but less than 3°c/1000 ft we have conditional stability stable if air dry (unsaturated) or unstable if air saturated. Question 130-18
In a layer of air decrease in temperature per 100 metres increase in height more than 1°c this layer can be described as being Stable unsaturated air unstable saturated air. more than 1°c/100 m = more than 3°c/1000 ft if environmental lapse rate (elr) more than 3°c/1000 ft (dry adiabatic lapse rate) environment unstable if environmental lapse rate (elr) less than 1 8°c/1000 ft (saturated adiabatic lapse rate) environment stable if environmental lapse rate (elr) more than 1 8°c/1000 ft but less than 3°c/1000 ft we have conditional stability stable if air dry (unsaturated) or unstable if air saturated. Question 130-19
Which statement true a conditionally unstable layer The environmental lapse rate less than °c/ m. more than 1°c/100 m = more than 3°c/1000 ft if environmental lapse rate (elr) more than 3°c/1000 ft (dry adiabatic lapse rate) environment unstable if environmental lapse rate (elr) less than 1 8°c/1000 ft (saturated adiabatic lapse rate) environment stable if environmental lapse rate (elr) more than 1 8°c/1000 ft but less than 3°c/1000 ft we have conditional stability stable if air dry (unsaturated) or unstable if air saturated. Question 130-20
The stability in a layer increasing if Warm air advected in upper part cold air in lower part. it similar to an inversion if a parcel of air forced to rise it will be colder than air it rising into so moment trigger stops lifting it it will sink back to level it started from because it more dense the layer stable. Question 130-21
Which of following statements concerning lifting of a parcel of air correct Unsaturated parcels cool more rapidly than saturated parcels. there less moisture in an unsaturated parcels to retain heat. Question 130-22
When in upper part of a layer warm air advected Stability increases in layer. it similar to an inversion if a parcel of air forced to rise it will be colder than air it rising into so moment trigger stops lifting it it will sink back to level it started from because it more dense the stability increases in layer. Question 130-23
The dew point temperature Can be equal to air temperature. it similar to an inversion if a parcel of air forced to rise it will be colder than air it rising into so moment trigger stops lifting it it will sink back to level it started from because it more dense the stability increases in layer. Question 130-24
Relative humidity depends on Moisture content temperature of air. it similar to an inversion if a parcel of air forced to rise it will be colder than air it rising into so moment trigger stops lifting it it will sink back to level it started from because it more dense the stability increases in layer. Question 130-25
When water evaporates into unsaturated air Moisture content temperature of air. a known phenomena when water evaporates into unsaturated air that air cooled the water transitioning from a liquid state to a gaseous state transitioning from a lower energy state to a higher energy state the energy required this transition to take place provided to water in form of heat that taken out of surrounding air this latent heat of vaporization leaving air causes a temperature of air to be reduced. Question 130-26
A moist but unsaturated parcel of air becomes saturated Lifting parcel to a higher level. air can hold a certain amount of water depending on it's temperature warmer air can hold more water vapour than colder air thus cooling air it can hold less water vapour the relative humidity increases how does air cool? usually increasing in height so to get an unsaturated parcel of air with say 40% of relative humidity to 100% of relative humidity (fully saturated a cloud) then you must cool parcel lifting it to a higher level. Question 130-27
A sample of moist but unsaturated air may become saturated Expanding it adiabatically. fabricet don't get why an unsaturated air mass could become saturated expanding it adiabatically compressing it relative humidity will increase until reaching 100% of humidity making air mass saturated if you compress it it will heat up if you expand it will cool during an adiabatic process heat neither added nor lost air can hold a certain amount of water depending on it's temperature warmer air can hold more water vapour than colder air thus cooling air it can hold less water vapour the relative humidity increases how does air cool? usually increasing in height so to get an unsaturated parcel of air with say 40% of relative humidity to 100% of relative humidity (fully saturated a cloud) then you must cool parcel lifting it to a higher level when it expands adiabatically it cools so relative humidity must increase. Question 130-28
The maximum amount of water vapour that air can contain depends on Expanding it adiabatically. the most commonly used measure of humidity relative humidity relative humidity can be simply defined as amount of water in air relative to saturation amount air can hold at a given temperature multiplied 100 air with a relative humidity of 50% contains a half of water vapor it could hold at a particular temperature concept of relative humidity we can say that amount of water vapour which air can hold largely depends on air temperature. Question 130-29
Convective clouds are formed In unstable atmosphere. the most commonly used measure of humidity relative humidity relative humidity can be simply defined as amount of water in air relative to saturation amount air can hold at a given temperature multiplied 100 air with a relative humidity of 50% contains a half of water vapor it could hold at a particular temperature concept of relative humidity we can say that amount of water vapour which air can hold largely depends on air temperature. Question 130-30
The most effective way to dissipate cloud by In unstable atmosphere. the most commonly used measure of humidity relative humidity relative humidity can be simply defined as amount of water in air relative to saturation amount air can hold at a given temperature multiplied 100 air with a relative humidity of 50% contains a half of water vapor it could hold at a particular temperature concept of relative humidity we can say that amount of water vapour which air can hold largely depends on air temperature. Question 130-31
Areas of sinking air are generally cloudless because as air sinks it Is heated compression. as air sinks to lower levels pressure increases which compresses air increasing density temperature as air temperature increases its capacity to hold water vapour increases relative humidity decreases. Question 130-32
The main factor which contributes to formation of very low clouds ahead of a warm front the Saturation of cold air rain falling into it evaporating. clouds form in front rain falls from them out of warm sector into cold sector latent heat absorbed when going from liquid to gas (vapour) at low levels you will have stratus nimbostratus clouds. Question 130-33
In an unstable layer there are cumuliform clouds the vertical extent of these clouds depends on Thickness of unstable layer. clouds form in front rain falls from them out of warm sector into cold sector latent heat absorbed when going from liquid to gas (vapour) at low levels you will have stratus nimbostratus clouds. Question 130-34
Which of following phenomena are formed when a moist stable layer of air forced to rise against a mountain range Thickness of unstable layer. lifting moist stable layer of air produces stratus. Question 130-35
The height of lifting condensation level determined Temperature dewpoint at surface. the height of a cloud base that results from lifting of near surface air can be estimated based on surface values of temperature dew point since height at which a cloud will form roughly height at which temperature dew point would become equal due to expansion of air as it rises to regions of lower pressure. Question 130-36
During an adiabatic process heat Neither added nor lost. the height of a cloud base that results from lifting of near surface air can be estimated based on surface values of temperature dew point since height at which a cloud will form roughly height at which temperature dew point would become equal due to expansion of air as it rises to regions of lower pressure. Question 130-37
The decrease in temperature per 100 metres in an unsaturated rising parcel of air Neither added nor lost. 1°c/100 m or 3°c/1000 ft this the dry adiabatic lapse rate. Question 130-38
The decrease in temperature per 100 metres in a saturated rising parcel of air at lower level of atmosphere approximately Neither added nor lost. dry lapse rate = 3ºc/1000 ft or 1ºc/100 m saturated lapse rate = 1ºc/1000 ft or 0 6ºc/100 m. Question 130-39
In unstable air ground visibility most likely to be restricted Showers of rain or snow. dry lapse rate = 3ºc/1000 ft or 1ºc/100 m saturated lapse rate = 1ºc/1000 ft or 0 6ºc/100 m. Question 130-40
A vertical temperature profile indicates possibility of severe icing when temperature profile Intersects °c isotherm twice. to intersect 0ºc isotherm twice there must be warm air above cold air this occurs at a warm front is where rain ice will be encountered.
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