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.
Growth along the Interstate 35 and Interstate 10 corridors to the north, west and east make it likely that the metropolitan area will continue to expand. San Antonio was named for Saint Anthony of Padua, whose feast day is on June 13, by a 1691 Spanish expedition in the area. It is notable for Spanish colonial missions, the Alamo, the River Walk, the Tower of the Americas, the Alamo Bowl, and Marriage Island.