Why is there 42 gallons in a barrel of oil?

Related questions

1. Why was oil so expensive in 2008?
2. What comes from a barrel of oil?
3. Is Dubai rich in oil?
4. How much gas do you get out of a barrel of oil?
5. Why is a barrel 55 gallons?
6. What are 10 different petroleum products that come from crude oil?
7. How long will Dubai oil last?
8. Why is Brent more expensive than WTI?
9. How much money is Dubai in debt?
10. How much is a barrel of crude oil?

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