What is the gas composition of air?

Question

Question PPL(H) - Private Pilot License - Meteorology

QuizVDS · Accepted Answer

Oxygen 21 % Nitrogen 78 % Noble gases / carbon dioxide 1 %

QuizVDS · Answer

Oxygen 21 % Water vapour 78 % Noble gases / carbon dioxide 1 %

QuizVDS · Answer

Oxygen 78 % Water vapour 21 % Nitrogen 1 %

QuizVDS · Answer

Nitrogen 21 % Oxygen 78 % Noble gases / carbon dioxide 1 %

Id 372 - PPL(H) EN - What is the gas composition of "air"?