Re: [gmx-users] Thermodynamic State of SPC/E bulk water, by genbox

2010-06-18 Thread David van der Spoel

On 2010-06-18 18.24, Sikandar Mashayak wrote:

Hi

When a bulk SPC/E water box(.gro) is created using the command genbox
-cs spc216.gro -box 4.0 4.0 4.0, what is the thermodynamic condition of
water?

Is it 300K at 1atm?

thanks
sikandar


No. You have to equilibrate because the box is not completely full.

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Dept. of Cell  Molec. Biol., Uppsala University.
Box 596, 75124 Uppsala, Sweden. Phone:  +46184714205.
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Re: [gmx-users] Thermodynamic State of SPC/E bulk water, by genbox

2010-06-18 Thread Sikandar Mashayak
I am concerned about the number density of water. At T = 300 K and P = 1
atm, SPC/E water has certain number density (no. of molecules/nm^3). With
genbox I get .gro file with 34.04 molecules/nm^3 number density, which will
remain constant even if I do equilibration in NVT simulation set up. So does
that 34.04 molecules/nm^3 corresponds to thermodynamic condition of water at
300K and 1 atm.

thanks
sikandar

On Fri, Jun 18, 2010 at 12:20 PM, David van der Spoel
sp...@xray.bmc.uu.sewrote:

 On 2010-06-18 18.24, Sikandar Mashayak wrote:

 Hi

 When a bulk SPC/E water box(.gro) is created using the command genbox
 -cs spc216.gro -box 4.0 4.0 4.0, what is the thermodynamic condition of
 water?

 Is it 300K at 1atm?

 thanks
 sikandar

  No. You have to equilibrate because the box is not completely full.

 --
 David van der Spoel, Ph.D., Professor of Biology
 Dept. of Cell  Molec. Biol., Uppsala University.
 Box 596, 75124 Uppsala, Sweden. Phone:  +46184714205.
 sp...@xray.bmc.uu.sehttp://folding.bmc.uu.se
 --
 gmx-users mailing listgmx-users@gromacs.org
 http://lists.gromacs.org/mailman/listinfo/gmx-users
 Please search the archive at http://www.gromacs.org/search before posting!
 Please don't post (un)subscribe requests to the list. Use the www interface
 or send it to gmx-users-requ...@gromacs.org.
 Can't post? Read http://www.gromacs.org/mailing_lists/users.php

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