A Cubic Meter equals 1000 liters and corresponds to the volume of a cube with 1 meter edges. Calculating the cubic meters of capacity of a pool is relatively easy, since you simply multiply the length, width and height. But if we want to calculate the cubic meters occupied by the water of a river, then the case changes. In these circumstances, the best we could do is try to get a rough estimate. Did you know that the impressive amount of 2.8 million cubic meters of concrete was used in the construction of the "Three Gorges" hydroelectric dam in China?
A Gallon is a unit of measure of volume for liquids, used in the community of Anglo-Saxon countries. The gallon of the United States, is not equal to the gallon of the United Kingdom. This is because, Britain began by indexing the gallon (known as the imperial gallon) to the volume of 10 pounds of water. While in the United States, the gallon was indexed to the volume of a cylindrical container (intended to contain wine), 6 inches long by 7 inches in diameter. Milk bottles marketed in the United States usually weigh 1 gallon (about 3.8 liters), while in countries with the international metric system these bottles are usually sold per liter.
`text(US gal lqd)=m^3 / 264.17`