1 calorie of heat is the amount needed to raise 1 gram of water 1 degree Centigrade. 1 calorie (cal) = 4.184 J. (The Calories in food ratings are actually kilocalories.) A BTU (British Thermal Unit) is the amount of heat necessary to raise one pound of water by 1 degree Farenheit (F). 1 British Thermal Unit (BTU) = 1055 J (The Mechanical Equivalent of Heat Relation) 1 BTU = 252 cal = 1.055 kJ.
San Antonio River Walk. A couple strolls along the River Walk. The San Antonio River Walk (also known as Paseo del RÃ­o or simply as the River Walk) is a network of walkways along the banks of the San Antonio River, one story beneath the streets of San Antonio, Texas, USA.
La Plata River. Written By: La Plata River, Spanish RÃ­o De La Plata, river in east-central Puerto Rico, rising on the western slope of Mount Santa (2,963 feet [903 metres]), a peak of the Sierra de Cayey. Part of the stream is impounded by Lake Carite; the reservoirâs outlet diverts waters for a series of hydroelectric stations on the GuamanÃ­ River in the coastal Guayama area to the south.