How were the Manhattan Project scientists able to predict the possibility of the atmosphere igniting after using an atomic bomb, and how did they come to the conclusion that the atmosphere wouldn’t ignite?

Question

Did the non-zero risk of the atmosphere igniting increase as nuclear weapon yields got larger and larger?

Obviously a result of watching Oppenheimer.

In: 789

Answer 1

They found out their atomic bomb wouldn’t ignite the atmosphere, after the first atomic explosion didn’t ignite the Earth’s atmosphere

Up until then, no one was absolutely sure it wouldn’t happen