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根據理想氣體狀態方程pv=nrt;即pv=mrt/M,因為m=ρv; 所以:ρ=pM/rt D=ρ(混)/ρ(A)=M(混)/M(A) M表示物質的摩爾質量. 所以D=ρ(混)/ρ(A)=m(混)/m(A)是錯誤的.
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