Many of us have been there, on a windy day we arrive home at the end of a long day to find our fence has fallen down! Either that or wake up in the morning and discover a view of the next door neighbours garden that wasn’t there the night before. Puts a slight dampener on things, doesn’t it!
Petrol from the pump is a mix of many organic components with different properties that determine the performance of the fuel. If left in an open container it will, in time, completely evaporate.