Energía Temperatura the degree or intensity of heat present in a substance or object. the ability to do work or produce heat Energy Temperature Sistema Calor part of the universe on which we wish to focus attention System a flow of energy due to a temperature difference Heat Alrededores Termodinámica everything else in the universe Surroundings the study of energy Thermodynamics Energía Potencial Energía Cinética energy due to position or composition Potential energy energy due to the motion of the object kinetic energy Trabajo Energía Interna force acting over a distance sum of the kinetic and potential energies of all "particles" in the system Works Internal energy Energía Temperatura Caloría Entalpia amount of energy (heat) required to raise the temperature of one gram of water by one degree Celsius to measure how much energy is produced or absorbed by a given reaction Calorie Enthalpy Calorímetro Petróleo used to determine the heat associated with a chemical reaction Calorimeter composed of hydrocarbons Petroleum Sistema Cerrado Sistema Abierto mass may not enter or leave Closed system mass may be exchanged with the environment Open system Motor Térmico a device that is capable of changing thermal energy into useful work heat engine Ley de la conservación law of conservation of energy Fluido Combustibles fósiles which refers to liquids, gases and vapors. Fluids energy can be converted from one form to another but can be neither created nor destroyed burning plants or decay products fossil fuels