good news Jihad! welcome back to war! If you break a thermomether inside a an airplane, the airplane crashes...check it out
There are plenty of reasons why you don't want to be around mercury under any circumstances. It's toxic, and can lead to emotional and mental instability. On planes, it can lead to structural instability. As in, ripping them apart. But how?
How does a plane, which is made to withstand being accelerated up to seven hundred miles an hour by burning jet fuel, get ripped to pieces by a broken thermometer? Chemistry, that's how. Chemistry is the modern equivalent to witchcraft. "Oh, add the XXXX-ate to the YYYY-ide, and they'll suddenly consume each other and produce a vapor that kills everyone in the room." That's the kind of statement that's made by a hag stirring a cauldron full of wool of bat. The only reason we don't start a modern day witch hunt is because everyone knows it's too dangerous to expose a chemistry professor to an open flame.
Of course it doesn't help that airplanes are the equivalent of flying soda cans, in that they are cylindrical and made of aluminum. Flimsy as it sounds, aluminum is a good choice in most situations. It's light, strong, and it has an outer 'shell' so hard that it's the next best thing to coating the plane in diamonds. Iron, so strong in buildings, rusts when, say, flying over the sea every day. And when it rusts when it combines with oxygen. It turns into light, red flakes that can be rubbed off. Aluminum, when it combines with oxygen, forms aluminum oxide, an incredibly hard substance that is scratch resistant. (The arbitrary and extreme difference between iron and aluminum's reaction to oxygen is yet further proof for chemistry-as-witchcraft.) Since it doesn't flake off, the way iron rust does, it seals the rest of the aluminum off, preventing further rust and making the entire structure perfect for air travel.
Mercury disrupts this perfection. Or, at least, it does the moment that it hits a part of the aluminum that has been recently scratched. The moment it does hit this, it combines with the aluminum, tearing it away from the larger structure. Of course, when the aluminum and mercury amalgam hits air again, the aluminum recombines with the oxygen to form that same, super-hard aluminum oxide. It just forms it in the wrong place, growing 'feathers' or 'pillars' of oxide up from the pool of mercury.
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