A steam boiler uses a continous cycle of evaportaion and condensation. Which of the following BEST explains why evaporation and condensation play an important role in a steam boiler?A.) Substances release heat energy when they evaporate and absorb heat energy when they condenseB.) Substances absorb heat energy when they evaporate and release when they condenseC.) Substances abosrb heat energy when they freeze and release heat energy when they boil.D.) Substances release heat energy when they freeze and absorb heat energy when they boil.
B is the answer...sublimation, melting and vaporization all absorb heat to cause these phase changes...deposition, freezing, and condensation release heat to their environments to cause the phase change...in a steam boiler, heat is being made available to an outside environment and condenses to return to the boiler...as steam, it leaves the boiler...
