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Sensei

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Everything posted by Sensei

  1. If you will mix 684 g of salt with 2000 g of water you will have total mass 2684 grams. 684 g / 2684 g = ~ 0.255 = ~ 25.5% by mass. According to wikipedia page about Dead Sea: "With a salinity of 342 g/kg, or 34.2%, (in 2011), " https://en.wikipedia.org/wiki/Dead_Sea but it's not only NaCl! References that you should read: https://en.wikipedia.org/wiki/Mass_concentration_(chemistry) https://en.wikipedia.org/wiki/Mass_fraction_(chemistry) https://en.wikipedia.org/wiki/Sodium_chloride Sodium Chloride has solubility in water ~ 359 g/L Here you have table how it changes with temperature: https://en.wikipedia.org/wiki/Solubility_table But Dead Sea is not just NaCl, but many other salts mixed together: https://en.wikipedia.org/wiki/Dead_Sea_salt Summing mg/L from the table we can get 338 g/L Notice that there is more Magnesium Chloride, and it has solubility 558 g/L @ 30 C. "Most oceanic salt is approximately 85% sodium chloride (the same salt as table salt) while Dead Sea salt is only 30.5% of this, with the remainder composed of other dried minerals and salts."
  2. and middle: https://www.youtube.com/watch?v=IhU6jml6NY4
  3. Raider5678, jackpot, conservatism from definition means trying to keep status quo... ..reluctance to accept change.. So "fix" in "conservative language" means "return to good old times"... which sounds to me often like "continue destruction of this planet as we you used to for entire century+".. ps. And then "some people" are "surprised" nobody wants to get on the Air Force One, on the plane...
  4. and 11 is simply delusional. Oh, really? Then how do you call mass invigilation? How do you call exchange of data with other secret agencies.. ? CIA can't work (officially) on e.g. US citizen, but e.g. MI5/MI6 can work on him/her, and then they just exchange data, e.g. CIA is giving what they have about e.g. UK citizen, and e.g. MI5/MI6 giving what they have about e.g. US citizen.. Some of them found secrets exceeding their imaginations...
  5. Whether there is day or night can be detected by microorganism/bacteria.
  6. Did you read wikipedia page of Isopropyl alcohol ? https://en.wikipedia.org/wiki/Isopropyl_alcohol "Toxicology Isopropyl alcohol and its metabolite, acetone, act as central nervous system (CNS) depressants,[27] and around 15 g of isopropyl alcohol can have a toxic effect on a 70-kg human if left untreated.[28] Poisoning can occur from ingestion, inhalation, or skin absorption. Symptoms of isopropyl alcohol poisoning include flushing, headache, dizziness, CNS depression, nausea, vomiting, anesthesia, hypothermia, hypotension, shock, respiratory depression, and coma.[27] Overdoses may cause a fruity odor on the breath as a result of its metabolism to acetone.[29] Isopropyl alcohol does not cause an anion gap acidosis but it produces an osmolal gap between the calculated and measured osmolalities of serum, as do the other alcohols.[27] Isopropyl alcohol is oxidized to form acetone by alcohol dehydrogenase in the liver,[27] and has a biological half-life in humans between 2.5 and 8.0 hours.[27] Unlike methanol or ethylene glycol poisoning, the metabolites of isopropyl alcohol are less toxic, and treatment is largely supportive. Furthermore, there is no indication for the use of fomepizole, an alcohol dehydrogenase inhibitor, unless co-ingestion with methanol or ethylene glycol is suspected.[30]" https://toxnet.nlm.nih.gov/cgi-bin/sis/search/a?dbs+hsdb:@term+@DOCNO+116 " ACCORDING TO CLINICAL EXPERIENCE ISOPROPYL ALCOHOL IS MORE TOXIC THAN ETHYL ALCOHOL AND LESS TOXIC THAN METHYL ALCOHOL. ... ITS ACUTE POTENCY AS CENTRAL NERVOUS DEPRESSANT IS ABOUT TWICE THAT OF ETHANOL. PROBABLE LETHAL ORAL DOSE FOR ADULT IS 8 OZ (240 ML), BUT AS LITTLE AS 20 ML IN WATER CAN PRODUCE SYMPTOMS. "
  7. Run Cloud Chamber, and entire room will smell IPA... After that you can have headaches.. Check electronics equipment shops (with resistors, diodes, transistors, LEDs, PICs, Arduino, etc. etc. not ready devices). IPA is used for cleaning electronics.
  8. Distillation and/or vacuum distillation.. ? but equipment is expensive (vacuum pump costs at least $400-$500).. but isopropyl alcohol I bought the last time for $6/L. Whether distillation will work or not, depends on what is contamination (and what are properties like e.g. boiling point).
  9. Sensei

    Latex test

    [math]\gamma[/math] [math]\gamma[/math] [math]\gamma[/math] It looks like Latex reacts to change of general font size (click Size and pick up f.e. 20)
  10. In the real Universe example, in cosmic space you can observe that photons from stars are redshifted or blueshifted. https://en.wikipedia.org/wiki/Redshift https://en.wikipedia.org/wiki/Blueshift ps. Velocity is not the same as speed. Velocity is vector, speed is scalar.
  11. Did you also notice that even white person heavily tanned, has changed skin smell.. ? http://lmgtfy.com/?q=smell+of+body+after+tanning
  12. No. Rational will be new buyers, to which I addressed my previous post.. Buy stocks, behind their back, so they won't be able anymore to lobby for keeping current state (destruction of this planet).. Oil&gas exploration company can become oil&gas producing farm. Product the same, but different method used to get it.
  13. So, buy their coal&oil&gas companies.. so they won't feel like "ripped off".. Then we can continue with the real green energy.. GMO modify algae, microorganisms, and let them produce methane/ethane/methanol/ethanol/benzene etc.. from CO2 from air, water and Sun's energy..
  14. Sensei

    MATTER

    I am reading/interpreting "definite shape"/"definite volume" as "fixed shape"/"fixed volume".. so reverse of them "no definite shape"/"no definite volume" should be understood as "variable shape"/"variable volume". (it's basic classical physics school question, so change of shape/volume due to temperature, like it could happen with e.g. metals we can omit)
  15. Sun made coal, sun made oil, sun made gas, indirectly, millions year ago, now it can make energy directly.. But that's pissing off, people like Trump, and his colleagues, as they are not smart enough to join solar panel business, they prefer to have steady income for coal&oil&gas, day by day, month by month, clients addicted and relying on stuff they sell, instead of sell-solar-panel-once-and-have-no-more-client-ever.. I would buy 14-18 m^2 of solar panels, and would never see electricity bill ever again.. That's what pisses off (and scares) these people. Expect more damages made by these people..
  16. Sensei

    MATTER

    The all answers 1,2,3,4 are true statements, but the right answer for your question is 4. Gases can be easily compressed. Two shapes might have the same volume.
  17. Tree near my apartment had ~25m, and it was cut at ~ 0.5m above the ground. It immediately released new branch from stump. And second one directly from roots from the ground. After two months they had 2 meters already.. There are plants which you can cut to couple, put pieces in the ground, and each of them will release new roots and become independent plant. It's called vegetative reproduction https://en.wikipedia.org/wiki/Vegetative_reproduction "With most woody plants, clonal colonies arise by wide-ranging roots that at intervals send up new shoots, termed suckers." "Trees and shrubs with branches that touch the ground can form colonies via layering, e. g. willow and blackberry." https://en.wikipedia.org/wiki/Clonal_colony https://en.wikipedia.org/wiki/Basal_shoot
  18. What will be source of heat? Just light from LEDs.. ? How many LEDs will be installed.. ? What will be their total power? How about thinking also about the most reflective material for surface (even tiny layer of it (electroplating?), if it's expensive).. ? Instead of bothering about heat, reflect photons, as much as you can (highly polished surface?) You have here table of reflectance coefficient per wavelength for couple metals Au, Ag and Al. https://en.wikipedia.org/wiki/Reflectance Search for and check materials reflectance table
  19. In Open Office there is such function which will filter cells depending on cell value. e.g. =IF(B2<0.1;B2;"" ) then select row, fill entire row, then select columns, fill entire columns.. and received this: Expected by your coefficients are these? They are lower than threshold 0.1 (even negative)
  20. Oh, I see where was problem.. you exported in CSV, but you have comma as decimal separator, not CSV field separator.. After replacing comma by dot, then replacing semicolon by comma, it loaded correctly in Open Office.
  21. Why not you cannot program? Everybody can program.. It does not look like what you said in the first post, at all.. Describing what it all means, will probably take longer time, than time spend on writing script..
  22. How are you keeping data? Is it Excel table? If so, you can export it to CSV (Comma Separated Values). It's easier to parse from external code. Then you can write little script in PHP, Perl, Python, or C/C++, which will load row by row, and analyze them, and return result that you want. ps. Maybe give the real example (CSV?) with just 2x2 fields.. so there will be 2x2 data per field. 16 total.
  23. Satellite transmission has extremely large delay (in comparison to optic fiber transmission e.g. transoceanic cable) Calculate distance from the ground to satellite (e.g. geostationary orbit), then to eventually other satellites, then from satellite to the ground, divide by speed of light.. It's minimal delay you can have. Double that if you're interested in reply delay. GEO are at equator ~ 36,000 km away. https://en.wikipedia.org/wiki/Geostationary_orbit Some use LEO (and require plentiful of satellites), some other use GEO orbits (less satellites needed for worldwide transmission). https://en.wikipedia.org/wiki/Satellite_phone
  24. Skype has been downloaded and installed on 1 billion+ smartphones already. https://play.google.com/store/apps/details?id=com.skype.raider
  25. The key is whether signal is digital or analog, the key is whether signal is compressed or uncompressed. Analog data are not compressed = single cable can transmit very small quantity of simultaneous voice transmissions. Digital data can be compressed: lossless compression (e.g. PNG, GIF, WAV) or lossy compression (e.g. MPG, MP3, DivX) Same cable transmitting compressed digital data, can contain dozen more data than the same cable transmitting analog signal. UDP packets don't demand confirmation of delivery from recipient. So sender (application) does not know whether data arrived to recipient at all. TCP packets require confirmation from recipient. If packet is lost, there is demanded resending of data. It slows down transmission a bit. VOIP usually uses UDP. Human can hear if there is a transmission error, the loss of some packets, as a crackling sound. And then you can tell other human to repeat.
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