<Tr> <Td_colspan="2"> Gas </Td> <Td_colspan="2"> Volume by various </Td> <Td_colspan="2"> Volume by CIPM - 2007 </Td> <Td_colspan="2"> Volume by ASHRAE </Td> <Td_colspan="2"> Volume by Schlatter </Td> <Td_colspan="2"> Volume by ICAO </Td> <Td_colspan="2"> Volume by US StdAtm76 </Td> <Td> <P> ▼ </P> <P> Tap </P> <P> this </P> <P> text </P> <P> to </P> <P> expand </P> <P> or </P> <P> collapse </P> <P> the </P> <P> table </P> <P> ▲ </P> </Td> </Tr> <Tr> <Td> ppmv </Td> <Td> percentile </Td> <Td> ppmv </Td> <Td> percentile </Td> <Td> ppmv </Td> <Td> percentile </Td> <Td> ppmv </Td> <Td> percentile </Td> <Td> ppmv </Td> <Td> percentile </Td> <Td> ppmv </Td> <Td> percentile </Td> </Tr> <Tr> <Td> Nitrogen </Td> <Td> (N) </Td> <Td> 780,800 </Td> <Td> (78.080%) </Td> <Td> 780,848 </Td> <Td> (78.0848%) </Td> <Td> 780,818 </Td> <Td> (78.0818%) </Td> <Td> 780,840 </Td> <Td> (78.084%) </Td> <Td> 780,840 </Td> <Td> (78.084%) </Td> <Td> 780,840 </Td> <Td> (78.084%) </Td> </Tr> <Tr> <Td> Oxygen </Td> <Td> (O) </Td> <Td> 209,500 </Td> <Td> (20.950%) </Td> <Td> 209,390 </Td> <Td> (20.9390%) </Td> <Td> 209,435 </Td> <Td> (20.9435%) </Td> <Td> 209,460 </Td> <Td> (20.946%) </Td> <Td> 209,476 </Td> <Td> (20.9476%) </Td> <Td> 209,476 </Td> <Td> (20.9476%) </Td> </Tr>

What is the weight of air in kg