Hi all,
Checking gas lines for leaks with soapy water is very dangerous
for oxygen, as soap contains fat.
Acetylene is 0.9 times as heavy as air, so it will not pool at
low level, propane is 1.56 times as heavy as air, methane 0.07,
and natural gas 0.55 - 0.65.
don’t blow yourself up, Markus