Wobbe index

The Wobbe Index (WI) or Wobbe number is an indicator of the interchangeability of fuel gases such as natural gas, liquefied petroleum gas (LPG), and town gas and is frequently defined in the specifications of gas supply and transport utilities. The Wobbe Index (WI) or Wobbe number is an indicator of the interchangeability of fuel gases such as natural gas, liquefied petroleum gas (LPG), and town gas and is frequently defined in the specifications of gas supply and transport utilities. If V C {displaystyle V_{C}} is the higher heating value, or higher calorific value, and G S {displaystyle G_{S}} is the specific gravity, the Wobbe Index, I W {displaystyle I_{W}} , is defined as: