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Keyword: 2ndlaw

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  • Why greenhouse gas warming doesn’t break the second law of thermodynamics (Really??)

    05/18/2011 12:30:54 PM PDT · by Ernest_at_the_Beach · 35 replies
    JoNova ^ | May 14th, 2011 | Joanne
    This is generating many comments, see below for an update!Behind the scenes some skeptics are suggesting that CO2 can’t warm us because the atmosphere is colder than the planet, and  it would break the 2nd Law of Thermodynamics (see Postma*, for example, p 6 – 7). I disagree. The 2nd Law of Thermodynamics applies to net flows of heat, not to each individual photon, and it does not prevent some heat flowing from a cooler body to a warm one. Imagine three blocks of metal side by side. They are 11°C, 10°C, and 9°C. Think about what happens to the...
  • Entropy Reversed

    07/18/2002 4:58:56 PM PDT · by Karl_Lembke · 36 replies · 462+ views
    BBC News ^ | 18 July, 2002 | Dr David Whitehouse
    The Second Law Can be Beat One of the most important principles of physics, that disorder, or entropy, always increases, has been shown to be untrue. .... A few years ago, a tentative theoretical solution to this paradox was proposed - the so-called Fluctuation Theorem - stating that the chances of the Second Law being violated increases as the system in question gets smaller. This means that at human scales, the Second Law dominates and machines only ever run in one direction. However, when working at molecular scales and over extremely short periods of time, things can take place in...