For me it helps to think about the cube root of the figure -- a billion cubic feet is 10^9, meaning a cube 10^3 feet on a side. About a fifth of a mile. A mete

For me it helps to think about the cube root of the figure -- a billion cubic feet is 10^9, meaning a cube 10^3 feet on a side. About a fifth of a mile. A meter is over 3 feet, so a cubic meter is over 3^3 or 27 cubic feet. You can ask google for a precise value: https://www.google.com/search?q=cubic+meter+in+cubic+feet https://www.google.com/search?q=cubic+meter+in+cubic+feet And 10^3 meters on a side would be a kilometer.