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My comment is responding to the parents comment about hydrogen fuel. https://www.hydrogenfuelnews.com/hydrogen-fuel-odorized/8550495/ https://www.hydrogenfueln

• ars 3y ago
  It's harder than is obvious, the odorant must spread in the same way that the hydrogen does under wind and buoyancy. Natural gas is a bit of a heavier molecule but hydrogen is very light and I suspect that the hydrogen and the smell would very rapidly separate. A bigger problem is that hydrogen can leak through tiny cracks, and odorant can't.