1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Calculate the force of an explosion from chemical reaction?

  1. Oct 30, 2015 #1
    Example, I have a mixture of 5 grams of oxygen and 10 grams of hydrogen. I ignite them. How much force will the explosion do?

    Yes, I did think about posting this in the chem category but this is about forces, right?
  2. jcsd
  3. Oct 30, 2015 #2


    User Avatar

    Staff: Mentor

    Sorry, but that's an extremely complicated, but largely meaningless question. It depends on both the explosion and the distance, shape, strength and mass of the object being impacted, and even then is a pretty weak description.

    Now, sometimes maximum over pressure is used, but more common is energy.
  4. Oct 30, 2015 #3


    User Avatar
    Science Advisor

    Note that the molecular weights of hydrogen and oxygen are very different. You would need mass ratio of approximately eight to one in favor of oxygen to achieve a number-of-atoms ratio of two to one in favor of hydrogen.

    I assume that you are trying to specify a perfect mix here.
  5. Oct 30, 2015 #4

    When you burn hydrogen it will release 120 MJ/kg (The lower heating value means that you do not take into account the condensation of the water vapor in combustion). Pressure and force depend on how this energy is released and are very case-dependent.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Calculate the force of an explosion from chemical reaction?