What percentage of its water capacity can a propane container be filled?

Propane containers are typically filled to 80% of their water capacity. This standard is in place due to the properties of propane, which expands when heated. By limiting the fill to 80%, there is enough space for the gas to expand safely without risking overpressure or potential rupture of the container.

Filling beyond this percentage could lead to hazardous situations, especially in varying temperature conditions, as the increased pressure could exceed the container's design limits. Consequently, a maximum fill level of 80% helps to ensure safe storage and handling of propane.