Could a person scuba diving take off his air tank and use it to propel himself?
Why isn't this one closed as a story set in a world? In what way is it worldbuilding?
Please see related Should we finally allow reality checks of other plot elements? - answer was generally no (-7 score).
Questions by LameZeldaPun was generally closed for being plot elements checks, whilst this question stays open. Currently it looks like popularity of question (or user) dictates on/off topic in such cases, and that's not fair.
As for A proposal to finalize the "are real world questions on-topic" debate - being real world question should not automatically make it stays open. One close reason being not applicable should not prevent closing with another reason. These two are independent issues, even if they often appear together.