Kilowatt-Hour per Unit of Fuel. The energy value of a unit of fuel depends on its mass, carbon and hydrogen content, and the ratio of carbon to hydrogen. In general, hydrogen generates approximately 62,000 BTU per pound and carbon generates around 14,500 BTUs per pound.
Quick Answer. The three largest rivers in Portugal are the Tagus River, the Douro River and the Guadiana River. All three rivers also flow through Spain. The largest river in Portugal is the Tagus River; it is 645 miles long. Continue Reading.
The Rapunzel's castle bit is actually around the Rhine Gorge, and while it is indeed spectacular, it's certainly not all this river is about. The Rhine is a hardworking and very busy main artery through Europe. Its tributaries include the Moselle (which runs southwest past Luxembourg into France), the Neckar (flowing southeast at Manneheim to Heidelburg) and the Main (which runs southeast from Mainz through to Frankfurt).