According to the second law of thermodynamics, energy flows in the direction of increasing randomness. This randomness is quantified as entropy, a universal value that always increases due to the inescapable dissipation of energy.Know More
Each time energy is transferred or transformed in an open system, some of this energy is lost in the form of random thermal vibrations called heat. Starting with a fixed amount of useful energy, the total amount of energy available to do work decreases until eventually all of this energy has dissipated as heat. Even if this resulting heat energy is trapped in a system, there is no way to restore it to its former form of useful energy without expending more than the original amount of energy.
As a result, energy always flows from more complex forms to less complex ones and from more concentrated forms to less concentrated ones. The flow of thermal energy from a higher temperature to a lower one or the flow of electrical energy from a higher voltage potential to a lower one are both illustrations of this. Even chemical reactions are subject to this law of thermodynamics, in which the total bond energy of the reactants of a spontaneous reaction is always less than the bond energy of the products.Learn more about Thermodynamics
Pyroclastic flows travel away from a volcano's vent at speeds up to 150 kilometers per hour. They contain hot gas, ash and rock at temperatures ranging from 100 to 800 degrees Celsius.Full Answer >
The factor that is necessary for the flow of heat from one object to another is that the two objects must have different temperatures. Heat always "flows," or moves, from the hotter object to the cooler one, unless there is some sort of external agent doing work.Full Answer >
Energy travels in the form of waves. Waves that require a material medium to propagate through are called "mechanical waves," while those that do not are called electromagnetic waves.Full Answer >
About.com explains that the law of conservation of energy states that energy cannot be created or destroyed. Energy can only be changed from one form to another, and the total energy of a system always remains constant.Full Answer >