열역학연습문제풀이

목차

1.3 Briefly define the following terms:
⒜ property
any measurable characteristic of a system
ex) temperature, pressure, volume, density, internal energy, enthalpy, etc
⒝ process
transformation of a system from one state to another ; successive path through which the system passes
⒞ cycle
a process or series of process whose initial and final state are identical
⒟ thermodynamic system
a region enclosed by a imaginary boundary that may be rigid or flexible
⒠ surroundings
everything external to the system

본문내용

1.24 Assume that the atmosphere may be assumed to be a static, isothermal, gas. Further assume that the pressure and density of the gas are related by . Derive an expression for the variation in atmospheric pressure with elevation from sea level in terms of pressure at sea level,., temperature, acceleration of gravity, , and gas constant .
sol)
ISOTHERMAL ATMOSPHERE 의 상태이므로 ( : 등온대기역 내에서의 기지의 밀도, 절대압력, 절대온도) 위 식에서 양변을 P로 나누어 정리하면 ( : : 해발 높이 )가된다. 양변을 또다시 적분하여 정리하면 초기값 일 때 이므로 위의 식에 대입하여 정리하면이 되고 따라서,가 된다.

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