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  2. Thermobaric weapon - Wikipedia

    en.wikipedia.org/wiki/Thermobaric_weapon

    A thermobaric weapon, also called an aerosol bomb, or a vacuum bomb, [1] is a type of explosive munition that works by dispersing an aerosol cloud of gas, liquid or powdered explosive. [2] [3] The fuel is usually a single compound, rather than a mixture of multiple substances. [4]

  3. Gas explosion - Wikipedia

    en.wikipedia.org/wiki/Gas_explosion

    A gas explosion is the ignition of a mixture of air and flammable gas, typically from a gas leak. [1] In household accidents, the principal explosive gases are those used for heating or cooking purposes such as natural gas , methane , propane , butane .

  4. Lifting gas - Wikipedia

    en.wikipedia.org/wiki/Lifting_gas

    While not a gas, it is possible to synthesize an ultralight aerogel with a density less than air, the lightest recorded so far reaching a density approximately 1/6th that of air. [12] Aerogels don't float in ambient conditions, however, because air fills the pores of an aerogel's microstructure, so the apparent density of the aerogel is the sum ...

  5. Flammability limit - Wikipedia

    en.wikipedia.org/wiki/Flammability_limit

    The term is considered by many safety professionals to be the same as the lower explosive level (LEL). At a concentration in air lower than the LFL, gas mixtures are "too lean" to burn. Methane gas has an LFL of 4.4%. [1] If the atmosphere has less than 4.4% methane, an explosion cannot occur even if a source of ignition is present.

  6. Explosive - Wikipedia

    en.wikipedia.org/wiki/Explosive

    An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An explosive charge is a measured quantity of explosive material, which may either be composed solely of one ...

  7. Gunpowder engine - Wikipedia

    en.wikipedia.org/wiki/Gunpowder_engine

    When the gunpowder was lit in the air-filled side, the rise in pressure would drive the water up the other side. [11] Like early steam engine designs, these engines used the air or vacuum created by gunpowder to directly lift the water. There were no mechanical parts in the manner of modern engines, which translate the power in the gas pressure ...

  8. Table of explosive detonation velocities - Wikipedia

    en.wikipedia.org/wiki/Table_of_explosive...

    The velocity of detonation is an important indicator for overall energy and power of detonation, and in particular for the brisance or shattering effect of an explosive which is due to the detonation pressure. The pressure can be calculated using Chapman-Jouguet theory from the velocity and density.

  9. Blast wave - Wikipedia

    en.wikipedia.org/wiki/Blast_wave

    The yield of the explosion was determined by using the equation: = () where is a dimensionless constant that is a function of the ratio of the specific heat of air at constant pressure to the specific heat of air at constant volume. The value of C is also affected by radiative losses, but for air, values of C of 1.00-1.10 generally give ...