Driving down the road yesterday they were repairing some electrical lines and I guess one of them sparked and it left a trail of blue sparks on the ground. But when I hook up a battery and short it with a wire sparks appear an orangish-yellow color.
Anyone know why?
In: Engineering
Sparks are, generally, not actually the electricity itself. Instead, they are small slivers of super-heated metal. The color is dependant on heat.
Now, sometimes it is electricity jumping from the source to a grounded object. In these cases, it will primarily be a flash of white light, but may tint blue depending on atmospheric conditions.
Edit: To clarify, the white and blue is the air super-heating, not electricity itself. You *might* see it go into the reds, but it is less likely.
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None of the answers so far have correctly mentioned the reason why electricity often appears blue. Electrical sparks are a result of ionizing the nitrogen in the air, which glows violet. It’s the same phenomenon that makes neon tubes glow.
The yellow and orange sparks you see are little bits of hot metal flying off whatever the electricity is burning up.
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Sparks are just hot pieces of things (usually metal), and they just happen to be glowing in that temperature range to produce red to white light. “Electricity” is that white/blue/sometimes purpleish color when it arcs because it’s actually turning certain elements in the air into a plasma. The arc is so hot it’s ripping electrons off the atoms, ionizing the gas, and the color light it gives off (called it’s emission spectrum) is that bright blue color.
The reason “electricity” is blue is because it ionises the nitrogen in the air, and when the atoms go back to a lower energy state, they shoot photons out.
The reason sparks are orange is because they’re not electricity, they’re just superheated bits of metal.
The electricity itself isn’t blue, per se. It’s the ionization of Nitrogen in the air that makes it look that way. When you burn metals or create a spark, you aren’t ionizing Nitrogen in the air, instead you are burning the material that caused the spark, which is going to burn a different color.
That’s about as ELI5 as I could get lol.
When you add electrical energy to a gas, it gets excited. Basically the electrons jump up to another energy level. When they come down to their natural resting level, that energy has to go somewhere, so the electrons emit photons. This is known as fluorescence and it’s also how fluorescent lights work.
Depending on what has all that extra energy, you get different colors of light. Excited air (nitrogen, oxygen, etc.) just happens to fluoresce in that iconic electric blue.
What you experience as sparks from electricity in your case has 2 causes. First of all, the sparks that fly off and glow orange are actually burning metal. Not molten. Burning. When metal is sitting at rest, it has a thin oxidation layer. In steel and iron it’s a thin coating of rust. Other metals also have it. When you knock some of that metal off with a decent amount of energy (like enough to ignite it) it immediately reacts with oxygen and burns, glowing bright briefly. In the case of a high tension line transformer or a car battery, there’s a ton of amperage involved. Add enough amperage, and some of that metal is going to fly off from the sudden flow of energy.
Otherwise, the sparks you see from the wire as it arcs to the terminals of the battery are the same as lightning, but they have another component that changes the color of the arc. Some of the wire is actually shooting off the end, over the arc, and onto the terminal. It’s also how arc welding works. The presence of the metal actually changes the composition, and thus the color of the arc.
No, not quite.
Ionization of the air causes the blueish sparking. Orange, yellow or other sparks are from the metal conductors used.
Its the same sort of thing used in fireworks – certain chemicals and compounds give a particular flame.
Its really as straightforward as that.
The blue or purple is superheated air letting of photons because the air cant hold that much energy. The sparks are usually the ends of the wires melting off because of the arc. Superheats the end till it melts and increases in resistance and then they boil off and that’s the spark you see. It’s all happening extremely quickly though.
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