Crude oil is sold between countries in quantities called barrels. (The same measurement is used to sell whisky.)

One barrel of oil is the same as:

• 159 litres (about 80 large fizzy drink bottle)
• 35 gallons (enough to fit in the petrol tanks of about 4 cars)
• 280 pints (a lot of bottles of milk)

The weight of a barrel depends on where the oil comes from. However, there are about 8 barrels in a tonne.

You could fit nearly 2 million barrels of oil into a football stadium - or one and a half tankers. This is how much oil we use in the UK every day.