The adiabatic flame temperature (theoretical maximum temperature) of black coal in air is over 2000oc. if the ambient temperature is 20oc then the theoretical maximum efficiency of a coal fired power station is approximately 87%.
why then is the efficiency of even the best coal fired power stations less than 50%.

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal. b. he is determining chemical properties that are sufficient to identify the metal. c. he is determining physical properties that are insufficient to identify the metal. d. he is determining chemical properties that are insufficient to identify the metal.

How might this scientific phenomena be explained? a paper clip floats on water.