{"id":321,"date":"2024-04-02T07:17:52","date_gmt":"2024-04-02T06:17:52","guid":{"rendered":"https:\/\/tutors4you.com\/?page_id=321"},"modified":"2024-04-02T07:17:52","modified_gmt":"2024-04-02T06:17:52","slug":"entropy-and-second-law-of-thermodynamics","status":"publish","type":"page","link":"https:\/\/tutors4you.com\/index.php\/entropy-and-second-law-of-thermodynamics\/","title":{"rendered":"Entropy and Second Law of Thermodynamics"},"content":{"rendered":"\n\n\t\t<div class=\"well well-sm\">\n\t\t\t\n\t\t\t <p align=\"left\"><font color=\"#000080\" size=\"4\"\n        face=\"Arial\">First law gives us an insight into a new\n        property called internal energy. Second law leads to a\n        new property cal entropy.<\/font><\/p>\n        <p align=\"left\"><font color=\"#000080\" size=\"4\"\n        face=\"Arial\">Entropy is a property which sets the\n        direction of irreversible processes in a closed system.\n        According to the entropy postulate &#8211; If an irreversible\n        process occurs in a closed system, the entropy S of the\n        system always increases, it never decreases.<\/font><\/p>\n        <p align=\"left\"><font color=\"#000080\" size=\"4\"\n        face=\"Arial\">Consider a hot bowl of soup in a room. Heat\n        will flow from the bowl to the room till the temperature\n        is equalized. It is an irreversible process. Heat can\n        never flow from the room back to the soup bowl and heat\n        up the soup again! This flow takes place till equilibrium\n        is attained. The entropy increases in this process.<\/font><\/p>\n        <p align=\"left\"><font color=\"#FF0000\" size=\"4\"\n        face=\"Arial\">Change in entropy:&nbsp; <br>\n        <\/font><font color=\"#000080\" size=\"4\" face=\"Arial\">The\n        change in entropy S<sub>f<\/sub> &#8211; S<sub>i<\/sub> of a\n        system during a process that takes the system from an\n        initial state i to a final state f as <\/font><\/p>\n        <p align=\"left\"><font color=\"#000080\" size=\"4\"\n        face=\"Arial\"><img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/03\/delta.jpg\" width=\"14\" height=\"16\">S\n        = S<sub>f<\/sub> &#8211; S<sub>i<\/sub> = <img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/03\/integral.jpg\"\n        width=\"14\" height=\"21\">dQ\/T<\/font><\/p>\n        <p align=\"left\"><font color=\"#000080\" size=\"4\"\n        face=\"Arial\">where:<br>\n        Q &#8211; Energy transferred as heat to or from the system\n        during the process.<\/font><\/p>\n        <p align=\"left\"><font color=\"#000080\" size=\"4\"\n        face=\"Arial\">T &#8211; Temperature of the system in Kelvin.<\/font><\/p>\n        <p align=\"left\"><font color=\"#FF0000\" size=\"4\"\n        face=\"Arial\">Entropy as a state function:<br>\n        <\/font><font color=\"#000080\" size=\"4\" face=\"Arial\">Entropy\n        like pressure, energy and temperature is a property of\n        the state of a system and is independent of how that\n        state is reached.<\/font><\/p>\n        <p align=\"left\"><font color=\"#FF0000\" size=\"4\"\n        face=\"Arial\">Second law of thermodynamics:<\/font><\/p>\n        <p align=\"left\"><font color=\"#FF0000\" size=\"4\"\n        face=\"Arial\">&nbsp;<\/font><font color=\"#000080\" size=\"4\"\n        face=\"Arial\"><img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/03\/delta.jpg\" width=\"14\" height=\"16\">S\n        &gt;= 0<\/font><\/p>\n        <p align=\"left\"><font color=\"#000080\" size=\"4\"\n        face=\"Arial\">In words, if a process occurs in a closed\n        system, the entropy of the system increases for\n        irreversible processes and remains constant for\n        reversible processes.<\/font><\/p>\n        <p align=\"left\"><font color=\"#000080\" size=\"4\"\n        face=\"Arial\">Thus if entropy decreases in one part of the\n        system, then it increases by an equal or larger amount in\n        another part of the system. Thus, the total change in\n        entropy is either zero or greater than zero.<\/font><\/p>\n       \t\t\n\t\t<\/div>\n\t\n","protected":false},"excerpt":{"rendered":"<p>First law gives us an insight into a new property called internal energy. Second law leads to a new property cal entropy. Entropy is a property which sets the direction of irreversible processes in a closed system. According to the entropy postulate &#8211; If an irreversible process occurs in a closed system, the entropy S [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-321","page","type-page","status-publish","hentry"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Entropy and Second Law of Thermodynamics - Tutors 4 You<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tutors4you.com\/index.php\/entropy-and-second-law-of-thermodynamics\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Entropy and Second Law of Thermodynamics - Tutors 4 You\" \/>\n<meta property=\"og:description\" content=\"First law gives us an insight into a new property called internal energy. 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