Kapasitas Kalor Gas dan Siklus Hukum II Termodinamika

Termodinamika 181

2. Usaha pada Proses yang Dialami Gas

2C H2?8 36B252 52=2 BE2?8 D6BDEDEA 52A2D 5:E329 62522??H2 6=2=E: 3636B2A2 ABC6C H2:DE ABC6C :CD6B2= ABC6C :C9B: ABC6C :C32B: 52? ABC6C 25:232D:

a. Proses Isotermal

BC6C :CD6B2= 252=29 ABC6C A6BE3292? 62522? C:CD6 A252 CE9E D6D2A.2 BC6CD6BC63EDC6CE2:56?82?EEH=6H2:DE , ?CD2?-:?;2E=29A6BC222?82C:562= ,=692B6?2CE9E 52?D6D2A22 , , O .C292H2?85:=2E2?C:CD652A2D5:D6?DE2?6?88E?22?A6BC222? 36B:ED , 56?82?, :=2: 52??CD2?C69:?88252A2D5:6=E2B2?52B:A6BC222?:?D68B2= =? 1 1 =? O=? 25: EC292 H2?8 5:=2E2? =69 C:CD6 A252 ABC6C :CD6B2= 252=29 =? O 7 2 .C29252B: 6 C2256?82?=E2C 52?36B?:=2:AC:D:72B6?22B29 ABC6C62?2? =E2C P O 2 P 2 3 .C29252B: 6C2256?82?=E2C 52?36BD2?52?682D:72B6?22B29 ABC6C6:B: =E2C O O 2 2OO 4 .C29252B: C2256?82??=2B6?2 D:52636?DE3:52?856?82? CE3E =E2C?H2 5 .C2926C6=EBE92?ABC6C 252=29 O .C292DD2=52A2D;E825:9:DE?8C642B2=2?8CE?8 DD2= =E2C 2O 2O Gambar 8.3 Kurva p–V dengan T konstan pada proses isotermal. p V V 1 V 2 p 2 p 1 E2=82C2B8?6E2:C642B2:CD6B2=A252CE9EL52B:F=E62G2= 6?;25: -6?DE2?EC292H2?85:=2E2?82CD6BC63ED = 7 :6D29E: = =E62G2= =E629:B Contoh 8.2 Mudah dan Aktif Belajar Fisika untuk Kelas XI 182

b. Proses Isokhorik

BC6C :C9B: 252=29 ABC6C A6BE3292? 62522? C:CD6 A252 F=E6 D6D2A .2 -:?;2E=29 632=: A6BC222? 62522? 82C :562= ,F=E6D6D2A , E?DE82C:562=56?82? 52? C6=2=E D6D2A :32D?H2 , ?CD2? 2D2E , , O 252 ABC6C :C9B: C:CD6 D:52 6?82=2: A6BE3292? F=E6 C69:?882 EC292 H2?8 5:=2E2? =69 82C C22 56?82? ?= H2:DE , 6BE3292?D62?2?A25282C22?6?H63232? A6BE3292? CE9E 82C :2 CE9E 82C 5:?2:2? D62?2? 52=2 82C 22? 36BD2329 C6A6BD: 5:DE?;E2? A252 .2 =E6 D:52 D6B A6?82BE9 A6BE3292? D62?2? 82C Gambar 8.5 Grafik p–T pada V konstan. p T Gambar 8.6 Grafik p–V pada tekanan p konstan. pPa VL V 1 V 2 ,63E29D23E?836B:C: =:D6B82C:562=A252CE9EL52?D62?2?P 2 -23E?8D6BC63ED5:A2?2C2?9:?8826?42A2:CE9E L:2F=E6D23E?85:3E2D D6D2AD6?DE2?D62?2?82C5:52=2D23E?8 7 :6D29E: , P 2 6BC222?62522?82CA252ABC6C:C9B: , , 2 , 600 K , P 2

c. Proses Isobarik

BC6C:C32B:252=29ABC6CA6BE3292?62522?C:CD6A252D62?2? D6D2A 252 .2 D2A2 329G2 A6BE3292? F=E6 D:52 6?8 92C:=2?A6BE3292?D62?2?,6CE2:56?82?A6BC222?82C:562= , D62?2? ,D6D2A52? , =692B6?2 52?C6=2=ED6D2A22 ?CD2?2D2E O B27:9E3E?82?2?D2B2 52?E?DEABC6C:C32B:D2A2A252 .2252ABC6C:C32B:D62?2?82C5:EC2922?D6D2AC69:?882 A6BE3292?CE9EA25282C22?6?:3E=2?A6BE3292?F=E682CE?DE 6A6BD292?2? 282B D62?2? 82C D6D2A .C292H2?85:=2E2?82CA252ABC6C:C32B:252=29C6CE2:56?82? A6BC222? 36B:ED , O , O Gambar 8.7 Grafik V–T pada tekanan p konstan. Gambar 8.4 Proses isokhorik pada grafik p–V. p p 1 p 2 V V 1 = V 2 Contoh 8.3 Tantangan untuk Anda Menurut Anda, benarkah angin itu tidak mendinginkan suhu, melainkan menaikkan suhu di sekitarnya? = .C292H2?85:=2E2?82CA252ABC6C:CD6B2=52A2D5:9:DE?856?82?23. 9 =? = = =? =? ;E=6 T suhu V volume