# How to convert $\rm kg/m^3$ to $\rm J/m^3$ for natural gas and biogas? [closed]

I want to convert from mass density to energy density:

• Natural gas has a density of $$0.8\: \rm kg/m^3$$.
• Biogas has $$1.15\:\rm kg/m^3$$.

I want to convert them into $$\rm J/m^3$$ so that I can compare the energy storage capacity for both fuels.

## closed as unclear what you're asking by Bob D, Jon Custer, Thomas Fritsch, ZeroTheHero, Aaron StevensSep 12 at 19:20

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• @FredWeasley You should be able to find estimates of J/kg. From there, using the density, it should be pretty straightforward to find how much energy it has per unit volume. You can just look at the units in this case and see what math you need to do to get from $\frac J{kg}$ to $\frac J{m^3}$ when you know $\frac {kg}{m^3}$. – JMac Aug 22 at 13:13