Hydrogen explodes
Thread Content
I read in some materials that hydrogen is a colorless and odorless gas that can explode at 500 degrees. The information provided is too general; if hydrogen is contained in a sealed container with no other gases present, only hydrogen, will it explode at temperatures above 500 degrees? Does it need air to explode? Can it be understood in this way? Thank you, points appreciated
Have you seen The Wandering Planet? It uses hydrogen explosions.
The explosive limit of hydrogen is 4.0%–75.6% (by volume), which means that when its volume concentration in air is between 4.0% and 75.6%, it will explode upon contact with a flame. However, when the hydrogen concentration is less than 4.0% or greater than 75.6%, it will not explode even if exposed to a flame.
An explosion that occurs without the need for any other medium is a physical explosion. It is not caused by a rapid expansion of volume due to combustion, but rather by an increasing volume as the temperature rises. However, in a sealed container, this increase in volume is restricted, so the pressure gradually rises. When the pressure becomes too high for the container to withstand, the container ruptures or explodes. What the original poster is referring to is probably the decomposition and explosion of hydrogen when a certain temperature is reached, right? I checked, and the decomposition temperature of hydrogen is above 1000°C; 500°C will not cause a decomposition explosion
500°C is likely the ignition point of hydrogen; it can burn only in the presence of oxygen. Hydrogen storage tanks are kept at positive pressure, so even if a leak occurs and ignition takes place, there will be only a burst of flame rather than an explosion. Unless the storage tank is subjected to a sudden increase in thermal radiation pressure that leads to a physical explosion, the pressure increases by 5 bar for every 10°C rise in temperature
When mixed with air at concentrations of 4.1% to 74.8%, or at concentrations of 18.3% to 59%, it is prone to explosion. The ignition point of hydrogen is 500 °C.
It uses the air on Earth to assist in combustion and then ignites; it’s not ignited by pure hydrogen! ! !
500 degrees Celsius is definitely not enough for a hydrogen bomb explosion； Chemical reaction explosions require an oxidizing agent to occur ； For a physical explosion, it depends on the pressure resistance of the container ； Conclusion: The claim that an explosion occurred at 500 degrees Celsius is imprecise and incomplete.