I believe the standard shelf life of petrol is around 6weeks in a normal fuel container.
in a non see through air tight container
yes as long as it wrapped in cling film or in an air tight container.
Then your container was not airtight.
The hermetic refers to being air tight. The term commonly used is hermetically sealed. An example of a hermetic container would we a glass jar, or any container with an air tight seal.
the air in the container expands
a sealed container or air tight clingfilm
That just refers to a seal that is gas (air, specifically) tight.
An air tight container to keep it from going stale.
sweat
No. Just put in an air tight container.
2 days in an air tight container
That just refers to a seal that is gas (air, specifically) tight.