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.
From/to south: The A2 goes all the way to the 25 de Abril bridge, which usually has lots of traffic getting into Lisbon, especially on weekday mornings. This is the best option if you want to go to the center of Lisbon or to the west (A5 - Estoril, Cascais, Sintra).