Why does the gas fill the entire vessel provided to him?

Gas molecules interact weakly with each other, do not have a crystal lattice and clear positions (such as molecules of metals and liquids). They move chaotically and erratically until they encounter an obstacle (vessel walls).
That is why the gas fills the entire volume provided to it.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.