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Консультация № 199434
26.10.2020, 20:18
0.00 руб.
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1
Здравствуйте! У меня возникли сложности с таким вопросом:
Помогите пожалуйста решить задачу по теплофизике :
В закрытом сосуде емкостью V=0,3 м3 содержится 2,75 кг воздуха при давлении p1=0,8 МПа и температуре t1=25℃. Определить давление и удельный объем после охлаждения воздуха до 0℃.
Заранее спасибо большое 😊
Помогите пожалуйста решить задачу по теплофизике :
В закрытом сосуде емкостью V=0,3 м3 содержится 2,75 кг воздуха при давлении p1=0,8 МПа и температуре t1=25℃. Определить давление и удельный объем после охлаждения воздуха до 0℃.
Заранее спасибо большое 😊
Обсуждение
30.10.2020, 01:06
общий
это ответ
Здравствуйте, kuznarskaavalentina!
Сосуд закрыт, поэтому ни объем, ни масса газа меняться при уменьшении температуры не будут. Процесс изохорический.
Поэтому удельный объем можно посчитать сразу же
V/m=0,3/2,75=0,11 м3/кг
Температура Т1=25+273=298 К
Температура Т2=273 К
По закону Шарля
р1/р2=Т1/Т2
Следовательно
р2=р1*Т2/Т1 = 0,8 МПа*273/298 = 0,73 МПа
Сосуд закрыт, поэтому ни объем, ни масса газа меняться при уменьшении температуры не будут. Процесс изохорический.
Поэтому удельный объем можно посчитать сразу же
V/m=0,3/2,75=0,11 м3/кг
Температура Т1=25+273=298 К
Температура Т2=273 К
По закону Шарля
р1/р2=Т1/Т2
Следовательно
р2=р1*Т2/Т1 = 0,8 МПа*273/298 = 0,73 МПа
5
Большое спасибо ????
Об авторе:
С уважением
shvetski
С уважением
shvetski
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