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.
From scenic floats for getting your light lager on, to (essentially) party lakes with a stronger current, here are the 16 top tubing rivers in the US. More: America's 10 Greatest Lake Towns in the Summer. Credit: Flickr/Derek Morrison. San Marcos River, TX. San Marcos, TX. Just down the road from Austin, San Marcos is a college town in the purest sense. The small city is one of the fastest growing and hardest partying in America, and the crown jewel is the San Marcos River.