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 Ebro, over 900 kilometres long, rises in the Cantabrian Mountains and empties via a large delta into the Mediterranean at the southern edge of Catalonia. Fed by several tributaries from the Pyrenees to the north and the Sistema IbÃ©rico to the south, the Ebro is Spainâs largest river in volume. On its way it touches Castilla-LeÃ³n and the Basque country before crossing La Rioja, Navarra, AragÃ³n and Catalonia.