Louisiana used nitrogen gas to put Jessie Hoffman Jr., 46, to death Tuesday evening in the state's first execution in 15 ...

In a chemical equation, the symbol ⇌ is used instead of an ordinary arrow if the reaction is reversible: Stage one Having obtained the hydrogen and nitrogen gases (from natural gas and the air ...

Louisiana's protocol says death row inmates will be forced to breathe pure nitrogen through a respirator mask for 15 minutes or for 5 minutes after the inmate's heart rate reaches a flatline on an EKG ...