PPL Meteorology questions with correct answers

International Standard Atmosphere ISA - Answer Pressure 1013.2Hpa Temperature 15*C Temperature decreases x 1.98*C every 1000ft Water Vapour - Answer An invisible gas made of water Humidity - Answer Amount of water vapour in the air - 2types: absolute (total amount) and relative (% of total air can hold) Absolute Humidity - Answer Total amount of water in the air Relative Humidity - Answer % of the total amount of water the air can hold Saturation - Answer State where the air cannot hold any more water vapour Saturation depends on: - Answer Amount of water vapour in the air, and the temperature of the air Condensation - Answer Changing water vapour into a liquid Dewpoint - Answer Temperature when a sample of air becomes saturated and condensation begins Evaporation - Answer When liquid water turns i