Dec 25, 2013 · Hey PF. I received a Himalayan salt lamp for xmas, and it's suppose to add more negative ions to the air which is good because apparently pollution mess's up the balance. …

Sep 19, 2008 · I'm not sure where this question belongs, maybe in chemistry? move it if necessary. so the quest is this I have a salt crystal lamp. it is a large block of salt on a wood …

Aug 30, 2005 · I 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 …

Jan 29, 2006 · The discussion clarifies the functionality of the two-twist mechanism commonly found in lamps, specifically those designed for 2-way and 3-way bulbs. These lamps require …

Aug 17, 2024 · Arc lamps of elements such as hydrogen, helium, neon, krypton, sodium, and mercury have several spectral lines from electron transitions that can be readily observed.

Jul 6, 2009 · I recently read that after a war was fought, the victors would salt the land of their defeated opponents to prevent anything from growing. I understand that the salt would suck …

Oct 27, 2010 · I have a power strip with a neon bulb that I would like to understand better. I can vary the voltage to the power strip by turning off and on an electric heater in the same room. …

Nov 28, 2019 · Infrared lamps emit wavelengths that are primarily in the infrared spectrum, allowing for effective heat transfer without visible light, while red heat lamps produce light that …

Nov 17, 2025 · Replies: 37 General Discussion S Why do we spend so little time learning grammar in college? Started by sevensages Nov 17, 2025 Replies: 137

Dec 15, 2025 · Hello everyone, I'm learning some astrophysics for fun, and love the fact that you get to play with the whole universe! I'm learning slowly, because I always have trouble …