初始时管内空气的压强p1=75cmHg-70cmHg=5cmHg
温度T1=7℃+273=280K,末时管内空气压强p2,温度T2=27℃+273=300K
设管的横截面积为S,气柱长度h,则气体体积Sh
由p1Sh1/T1=p2Sh2/T2,得5×0.15/280=p2×0.16/300,解得p2≈5.02cmHg
大气压强为p0,由p2=p0-70cmHg知,p0=75.02cmHg
初始时管内空气的压强p1=75cmHg-70cmHg=5cmHg
温度T1=7℃+273=280K,末时管内空气压强p2,温度T2=27℃+273=300K
设管的横截面积为S,气柱长度h,则气体体积Sh
由p1Sh1/T1=p2Sh2/T2,得5×0.15/280=p2×0.16/300,解得p2≈5.02cmHg
大气压强为p0,由p2=p0-70cmHg知,p0=75.02cmHg