Question

what is composition of air

Answer 1

Air contains many gases.
composition of air =
 Nitrogen 78%
 oxygen 21%
carbon dioxide 0.03% 
Argon 0.9%
other gases 0.07%

Answer 2

Answer:

Gas ______ Nitrogen ___ proportion (%by volum

nitrogen____N2____________78.1

oxygen_____O2____________20.9

carbon dioxide_CO2 __________0.03

Nobel gas____ _ _____________0.93

water vapor H2O ___ variable (keep changing from place to place and time to time )

smoke particles same

dust particles same