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.
This article is about the Old San Antonio Road. For the historic roadway which it is considered a part of, see El Camino Real de los Tejas National Historic Trail. The Old San Antonio Road (sometimes called El Camino Real or King's Highway) was a historic roadway located in the U.S. states of Texas and Louisiana. Parts of it were based on traditional Native American trails.