Why do we hear a popping sound when hydrogen burns at the mouth of the test tube...
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Heat causes gases to expand, and since a lot of heat is released the gaseous mixture (hydrogen, oxygen remaining from and water vapour liberated from the reaction) and the air adjacent to it expands very quickly, so quickly that the gas molecules break the sound barrier which causes the pop sound.
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Hydrogen gas is highly flammable. You can safely test for small quantities of hydrogen gas by holding a burning splint near to the top of the test tube. The positive result is a squeaky pop sound as the hydrogen reacts with oxygen in the air in a small explosion.
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