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Molecules in the combustion chamber of a rocket engine are
Chapter 10, Problem 35E(choose chapter or problem)
Molecules in the combustion chamber of a rocket engine are in a high state of random motion. When the molecules are expelled through a nozzle in a more ordered state, will their temperature be more, less, or the same as their initial temperature in the chamber before being exhausted?
Questions & Answers
QUESTION:
Molecules in the combustion chamber of a rocket engine are in a high state of random motion. When the molecules are expelled through a nozzle in a more ordered state, will their temperature be more, less, or the same as their initial temperature in the chamber before being exhausted?
ANSWER:Solution 35E The molecules inside the combustion chamber of the rocket were in a high state of randomness. When they will be more ordered while coming out through a nozzle, the randomness decreases. STEP 1: Here we should consider two cases. One is from statistical mechanics, which is, the average kinetic energy of a system determines the temperature of the system. So, if the average kinetic energy is high the temperature will be high. So, statistical mechanics tells that, when the molecules will come out through the nozzle, their speed will increase and it will increase the temperature