Question

What is the effect of pressure on the equilibrium of the nitrogen and oxygen to give nitric oxide?

Answer 1

The reaction has been investigated in the temperature range 223-298 K at apressure of 200 Torr of $N_2$ carrier gas. The influence of water vapor has been studied at 298 K. The yield of $HN{O}_3$ was found to increase in the presence of water vapour (by 90% at about 3 Torr of $H2O$).

So accurate pressure increases the formation of Nitric acid or presssure affects the formation of Nitric acid.