A megalitre or megaliter, depending on your chosen spelling convention.
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4.16 x 107 liters
2000 liters
1 hectolitre = 100 litres so 25 million hectolitres = 25*100*million = 2.5 billion litres.
500 x 1000 ie 5 million ml
Air expands or condenses to fill the shape it is in, so it is as big as the container it is in.