<Table> Major constituents of dry air , by volume <Tr> <Th colspan="2"> Gas </Th> <Th colspan="2"> Volume </Th> </Tr> <Tr> <Th> Name </Th> <Th> Formula </Th> <Th> in ppmv </Th> <Th> in % </Th> </Tr> <Tr> <Td> Nitrogen </Td> <Td> </Td> <Td> 780,840 </Td> <Td> 78.084 </Td> </Tr> <Tr> <Td> Oxygen </Td> <Td> O </Td> <Td> 209,460 </Td> <Td> 20.946 </Td> </Tr> <Tr> <Td> Argon </Td> <Td> Ar </Td> <Td> 9,340 </Td> <Td> 0.9340 </Td> </Tr> <Tr> <Td> Carbon dioxide </Td> <Td> CO </Td> <Td> 400 </Td> <Td> 0.04 </Td> </Tr> <Tr> <Td> Neon </Td> <Td> Ne </Td> <Td> 18.18 </Td> <Td> 0.001818 </Td> </Tr> <Tr> <Td> Helium </Td> <Td> He </Td> <Td> 5.24 </Td> <Td> 0.000524 </Td> </Tr> <Tr> <Td> Methane </Td> <Td> CH </Td> <Td> 1.79 </Td> <Td> 0.000179 </Td> </Tr> <Tr> <Th colspan="4"> Not included in above dry atmosphere : </Th> </Tr> <Tr> <Td> Water vapor </Td> <Td> H O </Td> <Td> 10 -- 50,000 </Td> <Td> 0.001 % -- 5 % </Td> </Tr> <Tr> <Th colspan="4"> notes : <P> volume fraction is equal to mole fraction for ideal gas only , also see volume ( thermodynamics ) ppmv : parts per million by volume Water vapor is about 0.25 % by mass over full atmosphere Water vapor strongly varies locally </P> </Th> </Tr> </Table>
<Table> Major constituents of dry air , by volume <Tr> <Th colspan="2"> Gas </Th> <Th colspan="2"> Volume </Th> </Tr> <Tr> <Th> Name </Th> <Th> Formula </Th> <Th> in ppmv </Th> <Th> in % </Th> </Tr> <Tr> <Td> Nitrogen </Td> <Td> </Td> <Td> 780,840 </Td> <Td> 78.084 </Td> </Tr> <Tr> <Td> Oxygen </Td> <Td> O </Td> <Td> 209,460 </Td> <Td> 20.946 </Td> </Tr> <Tr> <Td> Argon </Td> <Td> Ar </Td> <Td> 9,340 </Td> <Td> 0.9340 </Td> </Tr> <Tr> <Td> Carbon dioxide </Td> <Td> CO </Td> <Td> 400 </Td> <Td> 0.04 </Td> </Tr> <Tr> <Td> Neon </Td> <Td> Ne </Td> <Td> 18.18 </Td> <Td> 0.001818 </Td> </Tr> <Tr> <Td> Helium </Td> <Td> He </Td> <Td> 5.24 </Td> <Td> 0.000524 </Td> </Tr> <Tr> <Td> Methane </Td> <Td> CH </Td> <Td> 1.79 </Td> <Td> 0.000179 </Td> </Tr> <Tr> <Th colspan="4"> Not included in above dry atmosphere : </Th> </Tr> <Tr> <Td> Water vapor </Td> <Td> H O </Td> <Td> 10 -- 50,000 </Td> <Td> 0.001 % -- 5 % </Td> </Tr> <Tr> <Th colspan="4"> notes : <P> volume fraction is equal to mole fraction for ideal gas only , also see volume ( thermodynamics ) ppmv : parts per million by volume Water vapor is about 0.25 % by mass over full atmosphere Water vapor strongly varies locally </P> </Th> </Tr> </Table>
the major constituents of earth 's atmosphere are
the major constituents of earth 's atmosphere are
Nitrogen Oxygen Argon Carbon dioxide Neon Helium Methane Water vapor
Nitrogen Oxygen Argon Carbon dioxide Neon Helium Methane Water vapor