Recent content by coktail

  1. coktail

    Homebrewing beer and galvanic corrosion

    You assume correctly! I am doing BIAB. I have heard that stirring help to avoid scorching the bag, or that you can simply lift the bag while the heat is on. Or I could simply wrap my kettle in a blanket to keep the heat in during the steeping process. Still, I’m interested in having something...
  2. coktail

    Homebrewing beer and galvanic corrosion

    I’ve started home brewing beer recently, and I’m assembling equipment for my first 5 gallon batch. The technique I’ll be using requires me to put grains into a nylon bag and then steep that bag of grains in hot water (approx 160°), much like a giant teabag. The trick is that the bag cannot touch...
  3. coktail

    Symmetrical motion and resolving differences in FoR

    Thanks you so much, all! There's a lot here for me to digest and learn from, but I don't have further questions at this time.
  4. coktail

    Symmetrical motion and resolving differences in FoR

    By "reconciliation" I'm referring to the event or process in which their clocks go from disagreeing to agreeing with each other once more. This being a thought experiment with symmetrical motion, the clocks of the two observers should match by the time they return to a common FoR. That's what I...
  5. coktail

    Symmetrical motion and resolving differences in FoR

    Thanks very much for your response, Peter! Regarding the quote above, does the actual reconciliation occur during the turn-around itself, making what they visually observe as each other's clocks being sped up on the return trip merely a visual effect? Apologies if I'm confusing things.
  6. coktail

    Symmetrical motion and resolving differences in FoR

    Hi All, Long time no post! I've asked a highly-related question to the one I'm about to ask here, but there's a specific aspect of it that I'd love your input on. I understand that if two observers in the same location were to move away from each other symmetrically at a significant...
  7. coktail

    Black, reflected and emitted

    Thanks for the reply, Stargazer! I don't see how there could be light coming from inside the monitor when it's off, but maybe when it's on, the pixels of the screen that block the light are actually a truer black than when they are completely off. I don't know if this is possible. Would...
  8. coktail

    Black, reflected and emitted

    Thank you! As for question #2, it looks like it depends on the type of display. A plasma TV will actually turn off pixels to display black, but an LCD will block the light being emitted by a diode. I'm finding this information here: http://www.rtings.com/info/lcd-vs-led-vs-plasma/how-they-work
  9. coktail

    Black, reflected and emitted

    Hi all. I have a couple questions regarding the “color” black. First question, regarding reflected light: Would a perfectly black object with no reflectiveness to its surface absorb 100% of the light that hits it? If so, would it activate no rods/cones on the observer’s retina whatsoever...
  10. coktail

    Light - stopped or trapped inside a crystal?

    I'm bumping this thread in hopes that somebody has an answer regarding this experiment. Thanks!
  11. coktail

    Light - stopped or trapped inside a crystal?

    Thanks for posting. I have the same question. They also talked about this in the following episode of Radiolab: http://www.radiolab.org/2013/feb/05/
  12. coktail

    Uncertainty Principal: Limit of measurement, or the nature of things

    Hi! I found a few old threads lying around regarding this, such as this one, but I thought I'd start a new one asking the question in my own way. So here goes. Is the uncertainty described by the Uncertainty Principal a result of the fact that by measuring something we affect it, or a...
  13. coktail

    Natural vs. Synthetic

    Hi there, First time posting in Chemistry, so go easy on me. I'm wondering if there's any fundamental difference between synthetic and naturally-occurring compounds. By "fundamental" I mean some physical/chemical difference besides the process in which they came to be. Related to this...
  14. coktail

    Avatar not appearing on mobile

    Sold! I'm now a gold member :) This site has been incredibly valuable to me, so it's 100% worth it. Thanks, Greg!
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