Specific Weight of Propane-Butane: Density and Weight of 1 m³
Propane-butane is a liquefied hydrocarbon gas (LPG) obtained during oil processing and from associated petroleum gases. To keep the mixture in a liquid state, it is stored and transported under pressure.
In our country, the use of propane-butane is constantly growing. This is largely due to its advantages over gasoline: high octane number, cleaner combustion and lower cost. That is why propane-butane is widely used in automotive gas equipment (LPG systems), as well as for heating and household needs.
When working with this material, it is important to consider its physical properties, one of which is density.
Propane-butane density table
Despite the common search query “specific weight of propane-butane”, in practice density and the mass of a certain gas volume are usually used.
| Material | Gas density (g/cm³) | Weight of 1 m³ (kg) |
|---|---|---|
| Propane-butane (gaseous state) | 0.0018–0.0022 | 1.8–2.2 |
Note. For liquefied propane-butane, density is much higher and usually amounts to 490–619 kg/m³, depending on mixture composition and temperature.
Specific Weight Calculation
γ = ρ × gwhere γ is specific weight, ρ is density and g is gravitational acceleration (9.81 m/s²).
Propane-butane density
Propane-butane density depends mainly on temperature, pressure and the propane-to-butane ratio in the mixture. For gas, it is approximately 1.8–2.2 kg/m³, and for the liquefied state it is 490–619 kg/m³.
Conclusion
For engineering calculations, it is necessary to consider whether gaseous or liquefied propane-butane is meant, because their densities differ by hundreds of times.
Frequently Asked Questions
How much does 1 m³ of propane-butane weigh?
In gaseous state, 1 m³ of the mixture weighs roughly 1.8-2.2 kg. In liquid state, density is much higher: about 490-619 kg/m³.
Why distinguish gas and liquid phase?
LPG is stored as liquid under pressure but used as gas. Liquid and gas phase densities differ by hundreds of times and cannot be used interchangeably.
What affects propane-butane density?
Main factors are temperature, pressure and propane-to-butane ratio. Winter and summer mixtures may have different properties.
Can these values be used for filling cylinders?
No. The table is suitable only for reference mass and volume estimates. Cylinder filling, equipment adjustment and safety calculations must follow the gas data sheet, regulations and supplier instructions.