QNH: Altitude above sea level QFE: Height above aerodrome 8.10.20 Define: (a) QNH and altitude; (b) QFE and height.

Particles in the air are pulled towards the earth due to gravity. This is atmospheric pressure. The higher we are in altitude, the fewer air

Sea Breeze (Day): Air is heated over coast – Becomes low pressure and rises. Air is cooled over sea – Becomes high pressure and sinks.

High altitude air cools and becomes dense Dense air is flows down mountain slopes In New Zealand Katabatic winds are little Winds 8.14.4 Describe the

Cooled – Gas Condensates to Liquid. Liquid Freezes to solid. Heated – Solid Melts to Liquid. Liquid Evaporates to Gas. Rapid Heating – Solid directly

Gas Condensates to Liquid. Liquid Freezes to solid. Solid Melts to Liquid. Liquid Evaporates to Gas. Solid directly to Gas is Sublimation. Gas directly to

Relative Humidity is a relative measurement of how full of water the air is. Dew point is an absolute measurement of how much water the

When a gas is compressed its temperature increases. When it expands its temperature decreases. 8.18.10 Outline the term ‘adiabatic process’

Expanding air cools. Compressing heats. Dry Adiabatic lapse rate – rate dry air cools as it rises. Wet Adiabatic lapse rate – rate saturated air(cloud)

An inversion is where temperature increases with altitude. At night the earths cool surface can create a Radiation Inversion. Cold air over water moving over

Formation of cloud requires moist rising air and some dust/salt/smoke particles to form around. Cirrus – High level cloud. Thin wispy structure. Cumulus – Low

Cirrus – High level cloud. Thin wispy structure. Cumulus – Low level cloud. Fluffy white cotton ball shape. Stratus – Commonly low level. Sheet or