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.
Lisbon Is the Capital of Portugal. The capital of the country is Lisbon, and there are many Portugal facts relating to this beautiful and cosmopolitan city. Lisbon is the westernmost capital city in continental Europe, lying on the Atlantic Ocean and the River Tagus. It has a population of approximately 552,700.