› Forums › Atmospheric Phenomena › Huge atmospheric experiment starting › NO_2 / N_2O_4
17 March 2020 at 7:33 pm
#582115
![](https://britastro.org/wp-content/uploads/2018/09/picture-8621-1537263177-80x80.jpg)
Participant
Actually, gaseous NO_2 is in dynamic equilibrium with its dimer N_2_O_4, aka dinitrogen tetroxide. It is the former which has the characteristic brown colour, the dimer being colourless.
I always knew that A-Level chemistry would come in useful one day.