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.
more interesting sites. The climate of Lisbon (Portugal) Lisbon is the capital of Portugal and is situated on the banks of the Tagus River. The center consists of two parts, the old part and the new part. The new part was built on the remains of the old part which was destroyed by an earthquake and a tidal wave in 1755.