Sodium hydride (NaH) is a highly reactive compound that reacts violently with moisture and air. It can ignite spontaneously in air due to its reactivity with moisture and oxygen. Therefore, it is not recommended to store sodium hydride in air.
To safely store sodium hydride, it should be kept in a dry and inert atmosphere, such as under an inert gas like argon or nitrogen. It should also be stored in a tightly sealed container to prevent exposure to moisture and air. Additionally, precautions should be taken to prevent any accidental exposure to water or other reactive substances that could cause a dangerous reaction.