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برای اینکه کار در ترمودینامیک را به طور دقیقتر و از منظر مهندسی بررسی کنیم، مثال دیگری را ارائه میکنیم. گاز محبوس شدهای را در یک سیلندر و پیستون همانند تصویر زیر در نظر بگیرید. در این مثال، سیستم را به تنهایی و به صورت گاز تعریف میکنیم. هرآنچه که به جز گاز در این تصویر قرار دارد، محیط خوانده میشود. با تراکم گاز، ارتفاع جرم در محیط کاهش پیدا م...
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