工程热力学中热力学第一定律如何表述？闭口系统能量方程式的形式如何？ 什么是热力学第一定律，它的表达式是怎样的？
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绛旓細鐑姏瀛︾涓瀹氬緥鍏紡鏄柍U=Q+W銆傜儹鍔涘绗竴瀹氬緥鏄寚涓嶅悓褰㈠紡鐨勮兘閲忓湪浼犻掍笌杞崲杩囩▼涓畧鎭掔殑瀹氬緥锛岃〃杈惧紡涓衡柍U=Q+W銆傝瀹氬緥缁忚繃杩堝皵銆佺劍鑰崇瓑澶氫綅鐗╃悊瀛﹀楠岃瘉锛屾秹鍙婄儹鐜拌薄棰嗗煙鍐呯殑鑳介噺瀹堟亽鍜岃浆鍖栧畾寰嬨傚畠鏄儹鍔涘鐨勫熀纭锛岃屼笖鍦ㄨ兘婧愭柟闈㈡湁骞挎硾鐨勫簲鐢紝鑳芥簮鏄汉绫荤ぞ浼氭椿鍔ㄧ殑鐗╄川鍩虹銆傜儹鍔涘锛...
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绛旓細-(-鈭玽dp) =w - wt锛屾晠娴佸姩鍔熸槸鑶ㄨ儉鍔熶笌鎶鏈姛涔嬪樊銆傚綋 n锛1 鏃讹紝鑶ㄨ儉鍔熷ぇ浜庢妧鏈姛锛屽绛夊帇杩囩▼锛宯=0锛寃t=0锛屼絾 w=p(v2-v1)銆傚綋 n =1 鏃讹紝鑶ㄨ儉鍔熺瓑浜庢妧鏈姛锛屽嵆绛夋俯杩囩▼锛屼簩鑰呯浉绛夈傚綋 n锛1 鏃讹紝鑶ㄨ儉鍔熷皬浜庢妧鏈姛锛屽绛夊杩囩▼锛宯鈫+鈭烇紝w=0锛屼絾 wt=v(P2-P1)銆
绛旓細鐑姏瀛︾涓瀹氬緥瀹炶川涓婂氨鏄兘閲忓畧鎭掑畾寰嬨傜儹閲忓彲浠ヤ粠涓涓墿浣撲紶閫掑埌鍙︿竴涓墿浣擄紝涔熷彲浠ヤ笌鏈烘鑳芥垨鍏朵粬鑳介噺浜掔浉杞崲锛屼絾鏄湪杞崲杩囩▼涓紝鑳介噺鐨勬诲间繚鎸佷笉鍙橈紝杩欏氨鏄儹鍔涘绗竴瀹氬緥鐨勮〃杩板舰寮忋傚湪宸ョ▼鐑姏瀛鑼冨洿鍐咃紝鐑姏瀛︾涓瀹氬緥鍙〃杩颁负鐑兘鍜屾満姊拌兘鍦ㄨ浆绉绘垨杞崲鏃讹紝鑳介噺鐨勬婚噺蹇呭畾瀹堟亽銆傜儹鍔涘绗竴瀹氬緥...
绛旓細鎺㈢储鐑姏瀛︾涓瀹氬緥锛宸ョ▼鐑姏瀛︾殑鍩虹煶鐑姏瀛︾涓瀹氬緥锛屽鍚屽伐绋嬬儹鍔涘鐨勫熀鐭筹紝鎻ず浜嗚兘閲忚浆鎹㈠拰瀹堟亽鐨勫ゥ绉樸傚畠娑电洊浜嗗绉嶅舰寮忕殑鑳介噺锛屽鍐呭姩鑳斤紙 )銆佸唴浣嶈兘锛)銆佸寲瀛﹁兘锛)銆佸師瀛愯兘锛)鍜岀數纾佽兘(锛夛紝鍏卞悓鏋勬垚浜嗘垜浠墍璇鐨勭儹鍔涘鑳斤紝鐢ㄧ鍙 U 琛ㄧず锛屽崟浣嶆槸鐒﹁筹紙J锛夈傚綋鎴戜滑璋堣鐗╄川鐨勭儹鍔涘鑳芥椂锛...
绛旓細鍦宸ョ▼鐑姏瀛鑼冨洿鍐咃紝鐑姏瀛︾涓瀹氬緥鍙〃杩颁负锛氱儹鑳藉拰鏈烘鑳藉湪杞Щ鎴栬浆鎹㈡椂锛岃兘閲忕殑鎬婚噺蹇呭畾瀹堟亽銆傚熀鏈唴瀹癸細鐑彲浠ヨ浆鍙樹负鍔燂紝鍔熶篃鍙互杞彉涓虹儹锛涙秷鑰椾竴瀹氱殑鍔熷繀浜х敓涓瀹氱殑鐑紝涓瀹氱殑鐑秷澶辨椂锛屼篃蹇呬骇鐢熶竴瀹氱殑鍔熴傛暟瀛﹀紡鐨勮〃杈句负锛歈=鈻砋+W 鍦鐑姏瀛︿腑锛岀郴缁熷彂鐢熷彉鍖栨椂锛岃涓庣幆澧冧箣闂翠氦鎹㈢殑鐑负Q锛...
