Why does a glowing splint pop in a test tube filled with hydrogen?
It will only go POP if the test tube isn’t filled with H2. The pop occurs because there is a mixture of air (a source of O2) and H2. H2 burns rapidly when mixed with O2 to make water. In a test tube that really is filled with H2, combustion will only occur at the mouth initially, and then slowly burn down the test tube as air moves in to fill the space left by the H2 and condensing H2O. In such a case there is no pop. I’ve done this demo for over 40 years.
