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Showing content with the highest reputation on 12/03/23 in all areas

  1. Define 'comfort' Okay, that's an unusally low temperature. Recommended humidity for occupied rooms is 40%-60% RH because reasons. Air @ 10oC and 100% RH contains 9.4 g/m3 moisture (calculator here) Air @ 15oC containing 9.4 g/m3 moisture is @ 73.3% RH (same resource) If its a contractual obligation job, then dehumidification seems obligatory. However, there are other considerations to bear in mind. Maybe 73% RH is tolerable to you in which case, a modest addition of dry heat would do the job. Same if the initial humidity was more like 85% If the room is humid only because of your breathing/perspiration and it's less humid outside then maybe all that's needed is a small fan to increase the ventilation rate a bit. Most typical occupied spaces are best served with ~7 air changes per hour or they can get a bit clammy. (Up to double that figure for say a computer room) People are walking humidifiers emitting 6-7 MJ/day largely as moisture saturated warm air so there's major shifts in emphasis when dealing with small, busy rooms versus large sparsely occupied ones. Guess it's down to the individual. Personally, I find 50% a bit on the dry side these days, but it is the standard target for the HVAC industry etc (eg industry source) 600W of dry heat input would make a room this size quite warm quite quickly. I checked the site and it does indeed say that. Absolute nonsense. These values are what would be required to prevent condensation on say the inside of a single-glazed window. Following this guidance would be a health hazard for any occupants.
    3 points
  2. Example: Consider the Large Hadron Collider (LHC) at CERN. As far as I know it operates effectively irrespective of Earth's rotation or its orbit around the sun, which constantly changes the LHC's orientation. According to your theory, the LHC's performance should vary with these changes, necessitating regular adjustments? Could you explain how your theory accounts for the consistent operation of the LHC under constant change of orientation? What does the lack of adjustments for absolute motion tell you?
    2 points
  3. This is the York Marygate I remember from the early '60s. I'm not sure top left actually is Walker Street (during 'slum' clearance), as they were all very similar. I We were right by the river and I do remember being flooded out a couple of times. A bit of an inconvenience, but the area had more character than you can easily find these days.
    1 point
  4. Yes, 4c above an ambient of 10c. One of the joys of single-planed windows was 'Jack Frost's' work on them in the 60's and 70's. My earliest memory was tiptoeing on the stones laid in grass to the toilet (outhouse) at the end of the garden and relieving my bladder on iced water. Bath times were in front of the fire in a galvanized tin bath in the winter, otherwise it was in the square ceramic sink where Mum did the washing. Kitchen was a single-paned 'conservatory' extension with red tiles laid on dirt. Fun times.,
    1 point
  5. I'm still saying that, if the effect was big enough to matter, we would have found out about it. To be blunt, we would have found out the same way we learned that there was a problem with thalidomide. We would have noticed the victims. Let's flip this on it's head. If, as you suggest, the stuff is causing significant harm, how come things like the yellow card scheme (not to mention a stack of ambulance chasing lawyers) have not noticed it?
    1 point
  6. While I can't argue with that, the OP said this: If philosophy can determine just how much free will we actually have (I think it may not be as much as I think (50%ish), and I'm bloody sure it's not as much as you think (90%+)) and can persuade our populous, IOW politicians, of that knowledge; then prison's could become obsolete. So a definition is in order because how could you have 50% free will? I don't know what that means relative to a typical definition of free will. He then goes on to say philosophy can determine if it is a free will issue so we stop prosecuting people who commit crimes that are not their fault because they did not have free will. I can just imagine a judge explaining to some parents that he is sorry that their daughter was raped and killed by the defendant, but a group of philosophers have determined it is not the defendants fault because he did not have free will to stop it.
    1 point
  7. Find I have nothing I can usefully add now. Thanks for the reps anyway.
    1 point
  8. Hopeful there won't be too many pissing contests in the humidity thread. Comfort does seem very subjective, based on my experience living on a high arid steppe. Ms Vat and I have gotten so acclimated that when we travel east to someplace like Omaha it feels like driving into a Lousiana swamp. The thread has prompted me to think more about getting a humidifier, for the sake of skin and mucous membranes in the winter. Piano hygrometer was at 20 this morning. Came up to 22 after we boiled water for oats and made coffee, so kitchen activity doesn't make a big difference.
    1 point
  9. Given the variability in results one can find, I don't think that's "standard." You can easily find sources that say 30-50%, or 30-40%, 25-60%, or 40-60%; each of these show up in the first couple of dozen results on Google. (and it's always a range, not a number) My own experience was a couple of clock facilities with fairly tight control on temperature and humidity, with a target of 21 ºC and RH of 40% ± 3% and it always felt a little swampy. (Much lower RH meant a risk of electronics arcing, and above 50% risked mold, according to the lab/clean room design specs we had. They specified 30-50%, and we chose the middle) Comfort comes down to personal preference and what you're used to.
    1 point
  10. Aha, thanks very much. So would it be fair to say QFT is the mathematical underpinning of QED? I suppose it also plays the same role in QCD, doesn't it?
    1 point
  11. You can't split up a proton in the usual sense, as a proton is a bound state of quantum chromodynamics, and its "constituents" (quarks and gluons) cannot fly apart as such, but only form further particles. But they weren't in the proton before the collision, and some of them are similar to the proton itself. It's said that quarks are confined. So it's kinda like as if you try to split up a PC and, as a result, you get a bigger PC, a laptop, and a tablet. Those are not "parts" of what was there before. As to how much energy you need, the minimum is the rest energy of the particles you want to produce. If you want to split the quarks apart the answer is easier: infinite energy.
    1 point
  12. QFT is a mathematical framework. QED is a physical model.
    1 point
  13. Thank you. Yes, I'm familiar with it but it's not falsifiable, so I don't consider it an explanation of what I want to understand. Invoking a new universe every time a leaf makes a ripple on a pond is what I would call an ad hoc explanation.
    1 point
  14. If you google comfort zone you will get bogged down in psychobabble. But comfort zone is also the correct term in environmental engeering. here is the way to find the charts from google. https://www.google.co.uk/search?q=human+comfort+temperature+and+humidity&sca_esv=587264773&ei=HhZrZae3LryshbIP29OHwAU&oq=temperature+humidity+comfort+zone+chart&gs_lp=Egxnd3Mtd2l6LXNlcnAiJ3RlbXBlcmF0dXJlIGh1bWlkaXR5IGNvbWZvcnQgem9uZSBjaGFydCoCCAAyChAAGEcY1gQYsAMyChAAGEcY1gQYsAMyChAAGEcY1gQYsAMyChAAGEcY1gQYsAMyChAAGEcY1gQYsAMyChAAGEcY1gQYsAMyChAAGEcY1gQYsAMyChAAGEcY1gQYsANIw1JQAFgAcAF4AZABAJgBAKABAKoBALgBAcgBAOIDBBgAIEGIBgGQBgg&sclient=gws-wiz-serp
    1 point
  15. Ohm's law for a capacitor??? Are you really designing microprocessors? Not my topic, but capacitors build up voltage until it is the same as the voltage in the circuit. Then it behaves just like a insulator, so the current stops (unless you overload it...) As the capacities you mention, the 4.7 μF is slightly bigger, so it would take a tiny bit longer before the current ceases.
    1 point
  16. https://academic.oup.com/cid/article/26/2/384/508233 In vitro mutagenic activity and carcinogenic potential of metronidazole in certain animals raised concerns about its possible carcinogenicity in humans. We studied the late incidence of cancer after metronidazole use among persons enrolled in the Group Health Cooperative of Puget Sound, Seattle, a health maintenance organization. Randomly selected nonusers were matched on a one-to-one basis for age, gender, and year of enrollment to persons who used metronidazole on an outpatient basis during the period January 1975 to December 1983; 5,222 metronidazole user/nonuser pairs, for whom the median follow-up was 12.6 years, were analyzed. Forty-nine percent, 39.2%, 9.8%, and 2% of users had 1, 2–4, 5–9, and ⩾10 prescriptions or refills of metronidazole filled, respectively. The late (after the first 7 years of follow-up) incidence of cancer was nearly identical among users and nonusers (652 and 662 per 100,000 person-years, respectively; relative risk, 0.98; 95% confidence interval, 0.80–1.20). Age-gender stratified analysis did not reveal any association between metronidazole use and cancer. These data support no association between short-term exposure to metronidazole and cancer in humans. Although the results are reassuring, they may not extend to subjects who have used metronidazole for prolonged periods; further epidemiological studies should focus on these individuals.
    1 point
  17. Actually I was being stupid. The more basic point is that whatever water is used to make hydrogen is converted, when the hydrogen is oxidised in a fuel cell, to…….water! So it just becomes part of the water cycle, between atmospheric water vapour, rain and the oceans.
    1 point
  18. It can mean that. Many commercial greenhouse growers release CO2 in their greenhouses to increase productivity. It can also mean that some plants can survive in dryer areas. Plants have pores that they have to open to absorb the required amount of CO2 for growth. But open pores mean more evaporation, a loss that's necessary for the plant to get the required amount of CO2. If the CO2 levels are higher, they can open the pores less, and thus lose less water. It's been reported around the world that some marginal lands are getting greener as a result.
    1 point
  19. Do animals have consciousness, the gift of speech to describe the world? Do they observe the world?
    -1 points
  20. Are you ever going to actually present a relevant argument? Shit or get off the pot, pretty please... 🙏 I love dogging too... 😇 A neg, lol, I guess someone doesn't get the joke... 🙄
    -1 points
  21. ...but wait, I didn't create the issue. I have no choice! See this thread:
    -1 points
  22. Uncoerced You’re mixing frames and making another category error. You as an individual entity acted a certain way and society as an entity concluded that action was a mistake / against accepted social norms. You as an individual, however, still were subject to a set of basically unconscious chemical signals and electricity, propelled like an automaton who then later tells himself a story which pretends you had any control, and those signals drove you to execute that action. Both can be and are in fact true at the same time in parallel. You can continue being snarky and bitchy about this FACT in every post you make, but I can promise that doesn’t in any way bolster your stance nor result in me/others reconsidering mine. But this is at least IMO par for the course in most philosophy threads… mock others who disagree with you bc you’ve got nothing better to stand on. Useful as a metric similarly suffers from subjectivity. I’m grateful to have you as an ally in my desire to improve the way we as a society address criminality. Welcome aboard!
    -1 points
  23. You move away from the whole to the particular, trying to catch me up. I'm talking about the principle of receiving information of an item. Maybe a blind from birth person have a parent, or a friend, or relative, or social worker, who will give the information of an item to the person. The information obtained due to colours. So, it is WE always.
    -1 points
  24. That fact, that there are people who can't see, doesn't deny another fact, that there's no colour in the nature. And colour exists only in a human world. Human, because animals don't know what is colour, they don't know the word "colour", and they don't know the concept "colour". They "take" colour as it is. For animals colour is the way of survival. For humans colour is also the way survival and and it also has an aesthetic sense. All the masterpieces, pictures, books, photos, etc. are evidence of the world. Man also creates the world.
    -1 points
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