How many kilograms are in 40 liters of LPG?
How many kilograms are in 40 liters of LPG?
Answer
The density of LPG is 0.51 kg/L (liquid phase at 15 °C: propane 0.5076, n-butane 0.5845. A propane–butane mix has no single density — it depends on the blend). The source gives a band of 0.508–0.585 kg/L.
How the mass of 40 liters of LPG was worked out
0.51 kg/L × 40 L
=20.4 kg
The density comes from ISO 3993:1984. Liquid phase at 15 °C: propane 0.5076, n-butane 0.5845. A propane–butane mix has no single density — it depends on the blend.
Why a liter and a kilogram are not the same thing
A liter measures volume, a kilogram measures mass, and density is what ties them together: how many kilograms one liter of this particular substance comes to. The coincidence that makes people treat them as one thing is historical — in 1795 the gram was defined as the mass of one cubic centimeter of water, so a liter of water weighed a kilogram by construction. For anything else the equality breaks.
The extremes of this page make it obvious: one liter of LPG weighs 0.51 kg, while one liter of densely packed sand weighs 2 kg — four times more at the very same volume.
If the substance is not known in advance, start from how many kilograms are in 40 liters — the same volume across every substance at once.
The other way round: how much room a kilogram takes
This page starts from a volume and answers in kilograms. The opposite question — how many liters a given mass comes to — is what the kilograms to liters calculator is for. Both read the same density table, so the two pages agree wherever the answer is volume times density.
For LPG that means 40 liters weighs 20.4 kg here, and one kilogram of it takes 1.96 liters there.
Related Calculations
See Also
- Kilograms to Liters - How many liters are in a kilogram of water, honey, gasoline, sand and other substances — by density
- L to Ml - Convert Liters to Milliliters
- Sand Calculator - Cubic yards, tons and coverage for any area
- Topsoil Calculator - Cubic yards, weight and coverage for any area
<a href="https://calculat.io/en/volume/l-to-kg/40--lpg">40 liters of LPG = 20.4 kg - Calculatio</a>
How much 40 liters of each substance weighs
| Substance | Mass | Density, kg/L |
|---|---|---|
| Beer | 40.4 kg | 1.01 |
| Cement | 50–56 kg | 1.25–1.4 |
| Coal | 26.2–50.6 kg | 0.654–1.266 |
| Cucumbers | 24.8–25.6 kg | 0.62–0.64 |
| Diesel | 33.4 kg | 0.834 |
| Gasoline | 29.6 kg | 0.74 |
| Honey | 56.8 kg | 1.42 |
| Juice | 42.4 kg | 1.06 |
| LPG | 20.4 kg | 0.51 |
| Milk | 41.2 kg | 1.03 |
| Mineral spirits | 31.2 kg | 0.78 |
| Motor oil | 34 kg | 0.85 |
| Sand | 66–80 kg | 1.65–2 |
| Soil | 52–60 kg | 1.3–1.5 |
| Sugar | 28.8–36 kg | 0.72–0.9 |
| Tomatoes | 22–24 kg | 0.55–0.6 |
| Vegetable oil | 36.8 kg | 0.92 |
| Wall primer | 40 kg | 1 |
| Water | 39.9 kg | 0.998 |