已知 ρ=0.8*103(十的三次方) kg/m3
m=01kg
求V
∵ρ＝m/v
∴v=m/ρ=0.1kg÷0.8*103(十的三次方) kg/m3
＝0.125L=125ml
答：能量出100g酒精,量取125ml酒精即可