Weight Library
What liquids weigh.
Volume tells you if it fits; weight tells you if the trailer axle, slab or stand survives. Every density below is cited with its temperature basis — and fuels are shown as ranges, because grade matters and pretending otherwise would be wrong.
8.345 LB/GAL
Water
SG 1.000
7.05 LB/GALDiesel
SG 0.84–0.85 · range 7.0–7.1 lb/gal
7.2 LB/GALHeating Oil #2
SG 0.85–0.88 · range 7.1–7.3 lb/gal
6.3 LB/GALGasoline
SG 0.73–0.77 · range 6.1–6.4 lb/gal
4.24 LB/GALPropane (liquid)
SG 0.508
6.82 LB/GALKerosene
SG 0.80–0.83 · range 6.7–6.9 lb/gal
8.6 LB/GALMilk
SG 1.031
8.56 LB/GALSeawater
SG 1.025
7.2 LB/GALHydraulic Oil
SG 0.84–0.89 · range 7.0–7.4 lb/gal
11.85 LB/GALHoney
SG 1.40–1.44 · range 11.7–12.0 lb/gal
11.06 LB/GALUAN 32% Fertilizer
SG 1.326
10.65 LB/GALUAN 28% Fertilizer
SG 1.277
8.94 LB/GALCoolant 50/50
SG 1.06–1.08 · range 8.8–9.0 lb/gal
7.7 LB/GALVegetable Oil
SG 0.91–0.93 · range 7.6–7.8 lb/gal
6.59 LB/GALEthanol
SG 0.789
Rule of thumb worth memorizing: water is 8.34 lb/gal and 1 kg/L exactly enough for field work; light fuels run ~75–85% of water; fertilizer solutions and honey run ~130–145%.