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Bookmark or Share- Sodium vapor lamps - how do they work - Physics ForumsI don't quite understand the explanation at wiki; when the lamp is turned on it emits a dim red/pink light to warm the sodium metal and within a few minutes it turns into the common bright orange/yellow color as the sodium metal vaporizes. What does this mean (the vaporizes bit)? the sodium...
- Paint Statue that changes color with weather/airpressure - Physics ForumsI Found an old keepsake when I recently moved that I bought in Italy 15 years ago. It was a small statue of an owl that changed color when the weather was changing. It would be pink, blue most often or sometimes green. That statue itself didn't change, but rather it was the paint on it. The paint was kinda thick and sparkling.
- Aurora Forecast - Geophysical InstituteThe aurora is most often seen as a striking green, but it also occasionally shows off other colors, ranging from red to pink or blue to purple. Oxygen at about 60 miles up gives off the familiar green-yellow color, while oxygen at higher altitudes (about 200 miles above Earth’s surface) gives all-red auroras.
- Why Does the Pink Color in a Titration Fade Over Time? - Physics ForumsIn summary, the pink color obtained from the 2-3 phenolphthalein indicator at the end point of the titration gradually disappears over time due to the absorption of CO2 from the air, which produces the weak acid HCOOOH. This results in a drop in pH and the color of phenolphthalein is dependent on the pH of the solution.
- Plasma Color: What Makes It Blue & What Colors It Can Be? - Physics ForumsDepends on the lamp. Incandescents - while don't contain plasma - emit the light just because wire is hot. In gas discharge lamps atoms (or molecules) get excited by collisions with electrons or other ions/atoms that were accelerated by the electric field between electrodes, then they emit photons when falling back to lower energy states.
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