Hi,
I don't know whether LPG is sold in liters or Kilos - but my science says that it has to be sold in Kilos - LPG is a gas that takes a liquid shape when pressurised - the density of this liquified gas is extremely dependent on the existing pressure.
So, a liter of LPG pumped in at very high pressure is lot more than a liter of LPG pumped in at a lesser pressure - imagine this that there is a bunk where in the pressure maintained is so low that the LPG converts into a gasseous state. The volume (liter is a volumetric unit) of any gas is extremely dependant on the pressure - even after liquifying, the pressure plays a major role - So, if LPG is being sold in liters, there has to be a norm for pressure at which it is pumped as well - 1 liter of LPG at a pressure of say 3 bar / 4 bar.
The only thing that remains consistant is not the volume, but the weight of it - one kilo of LPG is always one kilo - irrespective of one bar or two bar.
Regards,
K Prasad
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