# gsw_entropy_from_t

    specific entropy of seawater

## Contents

- USAGE:
- DESCRIPTION:
- INPUT:
- OUTPUT:
- EXAMPLE:
- AUTHOR:
- VERSION NUMBER:
- REFERENCES:

## USAGE:

    entropy  =  gsw_entropy_from_t(SA,t,p)

## DESCRIPTION:

    Calculates specific entropy of seawater.

    Click for a more detailed description of entropy.

## INPUT:

    SA  =  Absolute Salinity                                        [ g/kg ]
    t   =  in-situ temperature (ITS-90)                            [ deg C ]
    p   =  sea pressure                                             [ dbar ]
           ( i.e. absolute pressure - 10.1325 dbar )

    SA & t need to have the same dimensions.
    p may have dimensions 1x1 or Mx1 or 1xN or MxN, where SA & t are MxN.

## OUTPUT:

    entropy  =  specific entropy                                [ J/(kg*K) ]

## EXAMPLE:

    SA = [34.7118; 34.8915; 35.0256; 34.8472; 34.7366; 34.7324;]
    t =  [28.7856; 28.4329; 22.8103; 10.2600;  6.8863;  4.4036;]
    p =  [     10;      50;     125;     250;     600;    1000;]

    entropy = gsw_entropy_from_t(SA,t,p)

    entropy =

    1.0e+002 *

       4.003894252787245
       3.954381784340642
       3.198664981986740
       1.467908815899072
       0.986473408657975
       0.627915087346090

## AUTHOR:

    David Jackett, Trevor McDougall and Paul Barker  [ help@teos-10.org ]

## VERSION NUMBER:

    3.05 (16th February, 2015)

## REFERENCES:

    IOC, SCOR and IAPSO, 2010: The international thermodynamic equation of
     seawater - 2010: Calculation and use of thermodynamic properties.
     Intergovernmental Oceanographic Commission, Manuals and Guides No. 56,
     UNESCO (English), 196 pp.  Available from the TEOS-10 web site.
      See section (2.10) of this TEOS-10 Manual.

    The software is available from http://www.TEOS-10.org