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Ok, to be honest, I don't believe about dragons having a special bladder or organ that stores up gas (especially methane) and having flint-like teeth or whatnot, or even having six limbs.

Here's my description about what my dragon looks like:

  • wyvern like with a head of a snake that spits out some kind of organic pyrophoric fluid for only as a defense (similar to that of a spitting cobra) and it shoot it from its FANG and NOT from its throat

spitting cobra enter image description here

I saw this video of what my dragon can do: https://www.youtube.com/watch?v=EmkBH-ncG1Y

  • roughly the same size as a Haast eagle
  • lives in arid habitat
  • mostly scavengers, but feed on small preys and kills them by snatching them, fling high up in the sky and throwing them to the ground
  • they don't use their teeth and instead swallow their prey whole as it fangs are hollow

For anyone who doesn't know the meaning of pyrophoric, it means any substances that ignite if it so much as touches air.

I'm not a biochemist but what kind of pyrophoric liquid that my dragon can able to store or create and if possible where can it get its source?

PLEASE DON'T GIVE ANY REFERENCES ABOUT THE BOMBARDIER BEETLE!! I AWARE OF IT AND IT'S NOT DEFINITELY THE ANSWER TO MY QUESTION!!

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    $\begingroup$ The Bombadier Beetle is an overused reference for dragon stuff, but I think it is very relevant here. $\endgroup$ – Aezyc Dec 24 '19 at 4:09
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Outside of magic a truly pyrophoric material is unlikely to ever exist in an animal. The only real way of doing it would be to find some precursor materials and squirt those from the body of the dragon forming the pyrophoric material in the air just before it ignites. But even that is unlikely in the extreme.

The dragon might like to read this:

But before deciding he/she should definitely also read this:

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    $\begingroup$ Please quote or summarise the relevant part of the linked pages, otherwise this reads like a comment $\endgroup$ – nzaman Dec 22 '19 at 11:28
  • $\begingroup$ Are pyrophorics that bad if kept away from oxygen? $\endgroup$ – ikrase Dec 23 '19 at 3:22
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Possibly steaming acid spit.

I actually did some research on this subject myself. As others have said, one reaction is the hydroquinone and hydrogen peroxide exothermic reaction. This is good, it means that producing hydrogen peroxide, which is a strong oxidizer, is biologically plausible.

Next, most bile or stomach acid contains hydrochloric acid. But if you were to say that the HCl acid was replaced with sulfuric acid, then mixed with the hydrogen peroxide, you would create an exothermic boiling reaction with a powerful acid as a result.

The resulting acid is known as pirhana solution. It has the ability to dissolve carbon compounds and can turn a cottonball into a coal black sludge in moments. One might even imagine that it could make flesh look scorched or that there might even be a sulfurous odor due to impurities in the mixture. It's used as a highly controlled cleaning solution.

This is the most plausible answer, or the nearest thing to fire I could come up with that might be realistically made by biology and effective as a weapon, at least to the best of my current knowledge of biology and chemistry. I will do some more research into pyrophoric substances and edit this answer if I find anything that jumps out at me.

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  • $\begingroup$ Green Dragon breath weapon, go! $\endgroup$ – Shalvenay Dec 25 '19 at 2:24
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The pyrophoric liquid could be NaK: sodium potassium liquid metal.

sodium potassium liquid metal fountain

The alloy of sodium and potassium forms a very lightweight liquid metal. Depicted is an electromagnetic fountain of this liquid metal, from the Periodic Videos series. From that video:

“It’s so reactive that it will react with the water in the air and it will be on fire before it even reaches the water. It is a liquid and therefore the surface is clean so the oxygen and water in the air can get to the surface much better than it could as a solid.” -Professor Martyn Poliakoff.

NaK explodes into flames in water, and also in air. The Backyard Scientist filled bullets with the stuff. These bullets acted like tracer bullets, leaving a stream of flames in the air.

NaK bullet

https://www.youtube.com/watch?v=T85d7ST2yxU&t=421s

NaK can be your pyrophoric liquid. As regards the possibility of synthesizing some in a biological entity - well, the raw materials are handy. Sodium and potassium salts are common and it is possible to treat each so as to derive the metal.

https://chemistry.stackexchange.com/questions/19500/extracting-sodium-from-salt

Exactly how the biochemistry of that would work is out of the scope of this question. I suggest the dragon store this stuff somewhere in its body under a lot of oil.

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    $\begingroup$ Biochemistry of a material that's both pyrophoric and water-reactive sounds inconvenient to me. $\endgroup$ – ikrase Dec 23 '19 at 3:23
  • $\begingroup$ @ikrase. Well, its really only pyrophoric if it is humid out. $\endgroup$ – Willk Dec 23 '19 at 3:45
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    $\begingroup$ I like it +1 for pointing out that exactly how the biochemistry works is out of scope for this question. How very true (and convenient!) $\endgroup$ – Slarty Dec 24 '19 at 18:01
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As noted, a true pyrophoric liquid would be rather unlikely for any creature, since the effects of an injury, or even the sphincter valve not closing properly would be catastrophic, if not fatal.

What is more likely is an external reaction like the Bombardier beetle uses:

they eject a hot noxious chemical spray from the tip of the abdomen with a popping sound.

The spray is produced from a reaction between two chemical compounds, hydroquinone and hydrogen peroxide, which are stored in two reservoirs in the beetle's abdomen. When the aqueous solution of hydroquinones and hydrogen peroxide reaches the vestibule, catalysts facilitate the decomposition of the hydrogen peroxide and the oxidation of the hydroquinone.1 Heat from the reaction brings the mixture to near the boiling point of water and produces gas that drives the ejection. The damage caused can be fatal to attacking insects. Some bombardier beetles can direct the spray in a wide range of directions.

https://en.wikipedia.org/wiki/Bombardier_beetle

A spray of boiling water and steam is almost as impressive as fire, much safer for the creature in the sense that the two compounds can be stored relatively safely and the act of mixing and spraying the chemicals takes place without too much danger to the user.

This also may explain some evolutionary features of your "dragon", since as a scavenger and a creature which hunts by dropping live prey from the sky there does not seem to be much need for offensive fire. However, if the glands are arranged around the cloaca, then a scavenger who is surprised while grounded and feeding could deliver a scalding burst of steam at the attacker before flying away.

If you must shoot "fire" from the mouth, then perhaps the precursor chemicals could be created in the Proventriculus, where they can be readily channeled back into the mouth.

enter image description here

How to make a fire breathing chicken....

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