质量=密度×体积 m=ρ×v
水的密度ρ=1千克/米3
987.5ml=0.9875L
1987.5ml=1.987.5L
1×0.9875=0.9875kg
1×1.9875=1.9875kg
1kg=2斤,0.9875kg=1.965斤,1.9875kg=3.975斤