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  1. #41
    Join Date
    Apr 2013
    Posts
    6,918

    Default Re: A Lesson in Physical Chemistry

    Quote Originally Posted by bedouin View Post
    Did you remember to account for the difference in atmospheric pressure on either side caused by the height difference
    No, I suspect I got the conversion to mm wrong by a factor of 10 as half my mind was on the stove too. Also left in a dividing 2 for the half gate height, not correct for the difference calculation. Poor show all round.
    Last edited by Hydrozoan; 28-11-18 at 13:37. Reason: Additional contrition!

  2. #42
    Join Date
    Apr 2013
    Posts
    6,918

    Default Re: A Lesson in Physical Chemistry

    Quote Originally Posted by TLouth7 View Post
    I agree on the 490 N/m^2, but I think this would be balanced by a drop of 50mm. 50kg/m^2 / 1025kg/m^3 = 49 mm

    The difference in density is 2.5%, so difference in surface height (from the equilibrium height) will be in the same ratio. 2000mm * 0.025 = 50mm
    Thanks - see above!

  3. #43
    Join Date
    Mar 2014
    Posts
    59

    Default Re: A Lesson in Physical Chemistry

    Blimey! That was hard work! 🌞

  4. #44
    Join Date
    Oct 2012
    Location
    Southminster, essex
    Posts
    9,422

    Default Re: A Lesson in Physical Chemistry

    σt = (ρ - 1000) kg m−3 when p = -g ρ z(TDS=[(A-B) * 1000]/mL)


    Yeah!!! b..dy right too !!!

    Has it occurred to anyone that the gates might be knackered & the lock keeper just gave the Op that waffle to stop him complaining,
    Last edited by Daydream believer; 18-12-18 at 10:00.
    It is all down to the fact that my wife does not understand me !!

  5. #45
    Join Date
    Aug 2007
    Location
    Suffolk
    Posts
    5,171

    Default Re: A Lesson in Physical Chemistry

    I think the gates have been very recently overhauled?

  6. #46
    Join Date
    Jun 2017
    Posts
    606

    Default Re: A Lesson in Physical Chemistry

    This doesn't add anything to the technical discussion, but just out of interest, a picture taken during the upgrade. Couldn't see my 'phone though.
    20180112_154544.jpg
    Oops, sorry, don't know how to rotate it.
    Last edited by Dan Tribe; 18-12-18 at 11:44.

  7. #47
    Join Date
    Oct 2016
    Location
    Currently Suffolk
    Posts
    1,079

    Default Re: A Lesson in Physical Chemistry

    Quote Originally Posted by Daydream believer View Post
    σt = (ρ - 1000) kg m−3 when p = -g ρ z(TDS=[(A-B) * 1000]/mL)


    Yeah!!! b..dy right too !!!

    Has it occurred to anyone that the gates might be knackered & the lock keeper just gave the Op that waffle to stop him complaining,
    The gates are fairly new, two years old perhaps? No complaining from me, well at least not until I was asked to help open the gate! The lock keeper and his pal had veins bulging in their necks trying to get the thing to move initially.
    "I thought my daffodils were yellow until I met Joe Kennedy."

  8. #48
    Join Date
    Jun 2017
    Posts
    606

    Default Re: A Lesson in Physical Chemistry

    Quote Originally Posted by Major_Clanger View Post
    The gates are fairly new, two years old perhaps? No complaining from me, well at least not until I was asked to help open the gate! The lock keeper and his pal had veins bulging in their necks trying to get the thing to move initially.
    My photo was taken on January 12th 2018, so just 1 year old.
    Last edited by Dan Tribe; 18-12-18 at 14:50.

  9. #49
    Join Date
    Oct 2012
    Location
    Southminster, essex
    Posts
    9,422

    Default Re: A Lesson in Physical Chemistry

    Quote Originally Posted by Leighb View Post
    I think the gates have been very recently overhauled?
    Badly?????
    It is all down to the fact that my wife does not understand me !!

  10. #50
    Join Date
    Aug 2009
    Location
    West Mersea
    Posts
    89

    Default Re: A Lesson in Physical Chemistry

    Good to see that the nondescript shed on Newlyn Pierhead has gained Grade 11 Listed Building status, presumably for services to chart datum?

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