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.
Portugal is a small country located in Western Europe at the western tip of the Iberian Peninsula. Beginning in the 1400s, the Portuguese, led by famous explorers like Bartolomeo Dias and Vasco de Gama and financed by the great Prince Henry the Navigator, sailed to, explored, and settled in South America, Africa, and Asia. Portugal's empire, which survived for more than six centuries, was the first of the great European global empires.