At What temperature and concentration does hydrogen explode?

Answer 1

Dihydrogen (hydrogen gas) is highly flammable and will burn at concentrations of 4% or more H2 in air. The enthalpy of combustion for hydrogen is −286 kJ/mol; it burns according to the following balanced equation. : 2 H2(g) + O2(g) → 2 H2O(l) + 572 kJ (286 kJ/mol) When mixed with oxygen across a wide range of proportions, hydrogen explodes upon ignition. Hydrogen burns violently in air. It ignites automatically at a temperature of 560 °C. Pure hydrogen-oxygen flames burn in the ultraviolet color range and are nearly invisible to the naked eye, as illustrated by the faintness of flame from the main Space Shuttle engines (as opposed to the easily visible flames from the SRBs). Thus it requires a flame detector to detect if a hydrogen leak is burning. The explosion of the Hindenburg airship was an infamous case of hydrogen combustion; the cause is debated, but combustible materials in the ship's skin were responsible for the coloring of the flames. Another characteristic of hydrogen fires is that the flames tend to ascend rapidly with the gas in air, as illustrated by the Hindenburg flames, causing less damage than hydrocarbon fires. Two-thirds of the Hindenburg passengers survived the fire, and many of the deaths which occurred were from falling or from diesel fuel burns. H2 reacts directly with other oxidizing elements. A violent and spontaneous reaction can occur at room temperature with chlorine and fluorine, forming the corresponding hydrogen halides: hydrogen chloride and hydrogen fluoride

Answer 2

Hydrogen can explode when mixed with air in concentrations between 4% and 75%, and ignited by a spark or flame. The explosion can occur at temperatures as low as 500 degrees Celsius. It is important to handle hydrogen with caution and follow proper safety protocols to prevent accidents.