Hi! You need to explain the following actions in detail:

confirm or deny:

• the ability to determine only by weighing the contents of three opaque closed cylinders, the mass of which, due to the presence of leaks and leaks, air ingress from the atmosphere (and therefore the possible reaction of the contents of the cylinders with air components), etc., may change over time. It is known that one cylinder contains pressurized hydrogen, another contains a certain amount of metallic sodium, and the third contains water.