Fire Types

In the film version of How To Train Your Dragon many of the dragons have unique types of fire. These differences make the dragons attacks much more unique. Here are some examples.

Nightfury: Nightfury's fire is a acetylene oxygen flame burning off of a semi-solid mass. When it hits a target it explodes on impact. The explosion is made up of a purple gaseous ring and a huge ball of fire at the center. The burst of flame will explode even if it does not hit a target (as can be seen when Hiccup is riding Toothless for the first successful test drive). Contrary to what the Vikings claim Nightfury's fire probably burns hotter than the Deadly Nadder's. This is because acetylene and oxygen can burn at around 9,000 degrees fahrenheit, while magnesium burns at around 5,600 degrees fahrenheit. However the mistake on the part of the Vikings is obviously understandable due to the fact that they had never seen a Nightfury.

Hideous Zippleback: The Hideous Zippleback has one of the most interesting ways of producing fire. Unlike most other dragon who breath in a flammable gas and then ignite it while exhaling, the Zippleback has one head that produces the gas and exhales it without igniting it. It is unknown what chemicals make up this gas, but it is known that it has an explosive effect and produces a great deal of smoke. The gas, after being exhaled, is then lit by a spark from the other head.

Deadly Nadder: The Deadly Nadder's fire is very hot. It is said to be able to melt steel and turn a Viking into ash in seconds. The Nadder's fire is made up of magnesium. This results in the fire burning in a brilliant bright white color with sparks flying off of it. Magnesium burns at around 5,600 degrees fahrenheit. The Nadder seems to be able to breath fire without taking a deep, open mouthed, inhale. It is never seen sustaining its fire for long periods. However, with how hot its fire is it never seems to need to.

Monstrous Nightmare: The Monstrous Nightmare has some of the most dangerous fire. It is very similar to napalm or kerosene gel. When the monstrous Nightmare breathes fire it stays this sticky almost lava like stream of fire towards its enemies. This fire is very destructive as it flows over houses and fields. Because the fire is sticky the Monstrous Nightmare often coats itself in it.

Gronckle: The Grockle's fire is a very unusual one. The dragon first eats rocks, which melt in its stomach, and then fires them as balls of molten lava. These lava blasts are shot out with great force and can cause serious damage it they hit their target. Attempting to block one of these blasts with a shield would probably not work. Because the blasts have a fairly solid base the blast will plow through obstacles until it hits something hard enough to splatter the lava ball.

I would appreciate if someone could source some of this. Also there probably are grammar errors