Liquid-Nitrogen

Drabble - Nightmare

Author: seedling-lotus

Rated: T

Links: FF.net / AO3

Warnings: Nightmare situation, panic, gore


Kanda was running. He wasn’t consciously sure why. Fear and panic swirled through his veins like liquid nitrogen as his heart pounded a tattoo against his ribs. He passed figures, human in form but demonically evil in expression with little other features visible.

Warm wetness fell from the sky and formed puddles on the bone strewn ground. Kanda knew better than to believe that it was rain. Rain was not red after all.

The bones gave way to skeletons as he ran, his feet catching on rib cages and femurs as he ran. Skeletons gave way to mutilated corpses. Kanda cringed each time his feet passed through decimated flesh. Corpses gave way to dead bodies and those gave away to dead comrades. Dead comrades he knew were alive. Nonetheless, he saw them lying dead in the bloody mud. He tried to run on but their fingers clung to his ankles, catching on his trousers and the edges of his long coat.

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Kind of like lava lamps but better! These jellyfish are real. They have died of natural causes, been harvested by these lamp makers, frozen in liquid nitrogen and encased in crystalline epoxy. They glow in the dark, due to the jellyfishes’ natural bioluminescence.

- messynessychic

5

So by my house is an ice cream place called ChillN. It makes ice cream that’s frozen using LIQUID NITROGEN! So they get the base - ice cream or frozen yogurt - and then they add the flavor (say you order Nutella ice cream, they add actual Nutella to the base. Same for the other favors). Then, they put it into these mixing bowls and start mixing, and then in the middle of mixing they just shoot out a bunch of Nitrogen and I swear to God that shit looks like a fucking witch’s cauldron. After that, they add the “Mix-N’s,” and there you go. Fucking Nitrogen ice cream. The reason is that since it cools it super fast, the ice crystals don’t grow as big so that you get INCREDIBLY smooth ice cream. It’s literally the coolest shit ever.

(Ice cream pictured above: Nutella with marshmallows and caramel)

6

High Speed Flower Explosions

Photographer Martin Klimas captures the destruction of flowers in this high speed series called Rapid Bloom where he drops flowers into liquid nitrogen and then shoots them with an air gun from behind. Klimas wanted to show the flower in one single shot, a flower in full bloom, turned into a fascinating piece of abstract art.

source

3

This week something adorable will be posted: fluorescence thermochromism!

During the last few weeks I have prepared ~25 new, not yet described compound that have a weak or strong fluorescence thermochromism. This means they emit an other color under UV lamp at a different temperatures. Most of these compounds work at -195 °C where liquid nitrogen boils, but some of them show some effect at -100 to -70 °C. 

How do these work? Depending on the temperature the bonds in these molecules change a lot what means they can absorb and emit different wavelength. As seen on the pictures, on the first there are the compounds, each ampule contains 100 mg. When irradiated with UV light at room temperature (second pics) few of them emit some visible light, but when they are cooled down with liquid nitrogen (last pics) most of the compounds emit a different wavelength light with a different intensity. 

LED Light in Liquid Nitrogen (It’s a rainbow!)

The Science: When an LED is immersed in liquid nitrogen, the electrons lose a lot of thermal energy, even when the light isn’t turned on. When this happens, the bandgap in the semiconductors increases. Since this gap is increased, when electrons in the conduction band fall to the valence band, they emit a higher energy light, meaning the light emitted has a shorter wavelength and a higher frequency. This is why we see the orange light turn into colours that are higher on the electromagnetic spectrum when it is frozen in the liquid nitrogen.

source

6

What happens to a liquid in a cold vacuum? Does it boil or freeze? These animations of liquid nitrogen (LN2) in a vacuum chamber demonstrate the answer: first one, then the other! The top image shows an overview of the process. At standard conditions, liquid nitrogen has a boiling point of 77 Kelvin, about 200 degrees C below room temperature; as a result, LN2 boils at room temperature. As pressure is lowered in the vacuum chamber, LN2’s boiling point also decreases. In response, the boiling becomes more vigorous, as seen in the second row of images. This increased boiling hastens the evaporation of the nitrogen, causing the temperature of the remaining LN2 to drop, the same way sweat evaporating cools our bodies. When the temperature drops low enough, the nitrogen freezes, as seen in the third row of images. This freezing happens so quickly that the nitrogen molecules do not form a crystalline lattice. Instead they are an amorphous solid, like glass. As the residual heat of the metal surface warms the solid nitrogen, the molecules realign into a crystalline lattice, causing the snow-like flakes and transition seen in the last image. Water can also form an amorphous ice if frozen quickly enough. In fact, scientists suspect this to be the most common form of water ice in the interstellar medium. (GIF credit: scientificvisuals; original source: Chef Steps, video; h/t to freshphotons)

5
liquid nitrogen + hot dogs = dry ice BBQ

Did you know your body is made of 3% nitrogen? When you crack your knuckles that sound you hear is actually the sound of nitrogen gas bubbles popping!

Pressurized liquid nitrogen can also be used to instantly freeze almost any fleshy matter! Tara and Anthony try using liquid nitrogen to cook food in this episode of Hard Science! (Spoilers: It tastes pretty terrible.)

Watch Hard Science on YouTube!

4

Fluorescence thermochromism of pyridine-copper-iodide complex. At room temperature it has a yellow emission, but when it is cooled with liquid nitrogen to low temperatures (-195 °C) the fluorescent color changes to blue/purple. When the ampule is removed from the nitrogen and warms up, the color changes back.

On the gifs I placed an ampule in a transparent Dewar flask with some liquid nitrogen inside it. Between the walls of the glass there is vacuum what acts as a thermal insulator and prevents the liquid nitrogen from fast evaporation. 

8

     On July 4th, 2014, I photographed A-12 #06938, on display at the USS Alabama Museum in Mobile, Alabama. Even though I’ve photographed #06938 numerous times, I always attempt to create fresh, interesting photos. This time, I photographed the two the liquid nitrogen tanks in the nose gear bay, shown in the final photo. The liquid nitrogen was stored in these tanks, converted into gaseous nitrogen, and used to inert the atmosphere in the aircraft’s fuel tanks. This inert nitrogen atmosphere was required, because the fuel heated 350° Fahrenheit inside the tank during flight. At that temperature, an ambient air environment could have caused combustion inside the fuel tank. If the nitrogen environment could not be achieved during flight, there was a danger of combustion inside the fuel tank.

     The Blackbird aircraft has what we call “wet wings”, which means that the skin panels of the wings and fuselage double as a fuel tank. There is no bladder inside the aircraft to hold the fuel, and every joint and screw has to be sealed from the inside, to prevent fuel leakage. When the aircraft flew at full speed, Mach 3.2, the compression of the air against the surface of the aircraft would cause serious heating, up to 620° Fahrenheit in some places. This heating would cause the entire length of the aircraft to grow about five inches in flight.

     When the aircraft would constantly contract and expand, it would cause the sealant in the fuel tanks to wear out, and fuel leaks would take place. These leaks were monitored by maintenance crews, measuring them in drips per minute (DPM). If the DPM reached its tolerance in a certain area, maintenance crews would go inside the fuel tanks, and reseal the area, which was a nightmarish process.

     Nearly every time I photograph a Blackbird in a museum, I hear a museum guest mistakenly saying, “The Blackbird had to refuel mid-air immediately after takeoff, because it leaked so badly.” This is not true. The real reason they refueled after takeoff was, when the Blackbird was fueled on the ground, the atmosphere inside the tank was ambient air. This had to be replaced with gaseous nitrogen before they reached full speed. When the tanker aircraft topped off the Blackbird’s tanks, all of the ambient air would be expelled from the tanks through relief valves. Then, as the aircraft consumed fuel, the space created in the fuel tanks would be replaced with gaseous nitrogen. This created a safe, inert atmosphere in the fuel tanks. If the aircraft, for some reason, could not create this 100% nitrogen atmosphere, the flight could not exceed 2.6 Mach. 

     It was possible to fully fuel, then defuel the aircraft to a partial load on the ground, before flight, to create this inert nitrogen tank environment, but this was a maintenance nightmare. This procedure was called a “maintenance yo-yo.” When you put the gaseous nitrogen head pressure in the fuel tanks on the ground, it caused excessive leaking, so maintenance always preferred to perform this procedure in the air, after takeoff.