Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Second type perpetual motion machine is existent .

  1. Aug 17, 2005 #1
    second type perpetual motion machine is existent .

    Let us assume that a system make a circulate of thermodynamics ,if we can approve that entropy will not equal to 0 , so the second law of thermodynamics is wrong ,and the second type perpetual motion machine is existent .

    The entropy will be changed as the change of temperature of liquid
    We assume a experiment : a round glass contain with mercury ,there is a glass tube inserted in the top of glass contain erect .
    1. first we assume that the temperature of the system is 20℃
    2. the temperature of system move up to 30℃,so mercury entry glass tube ,then the gravitational potential energy of mercury will be increased .these energy is come from outside ,so the system will get more heat quantity .
    3. then we turn the glass contain to set glass tube level, so the gravitational potential energy will send out energy .
    4. then we let the temperature down to 20℃,whole mercury will back contain ,the system will send out heat quantity Q2 ,but Q2 <Q1 ,if we compare the step with the second step.
    5. turn the contain to erect glass tube .
    since the potential energy before and after experiment is equal .
    we can know DS is not equal 0 .
    So the entropy and the second lay of thermodynamics are not right
  2. jcsd
  3. Aug 17, 2005 #2


    User Avatar

    Staff: Mentor

    Your English is pretty poor, but it looks like you are saying that you get more energy back from a system than you put into it. Sorry, but you won't. It looks like your error is in step 4: when the temperature drops from 30 to 20F, you don't get any potential energy back because the system is already horizontal and you've already recovered the PE.
  4. Aug 18, 2005 #3


    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    Dear PF member,

    The thread is locked because it contains opinions that are contrary to those currently held by the scientific community. This is against the Posting Guidelines of Physics Forums. If you would like to discuss your ideas, we invite you to submit a post to the Independent Research Forum, subject to the applicable guidelines, found here.

    We appreciate your cooperation, and hope you enjoy the Forums.

    Best regards,

    The Staff of Physics Forums
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Second type perpetual motion machine is existent .