# What I want

A function with pressure and temperature as input parameter and enthalpy as output. I am using R but any hint for choosing an algorithm/model would be appreciated.

# Data

# A tibble: 521 x 3
pressure temperature enthalpy
<dbl>       <dbl>    <dbl>
1     2.36         -15    1444
2     2.36         -15     131.
3     1            -10    1471
4     2.91         -10    1451
5     2.91         -10     154
6     5            -10     154.
7    10            -10     154.
8    15            -10     155.
9    20            -10     155.
10    25            -10     156.


Please note for each temperature there are two points with same temperature and pressure but different enthalpy. That is physical sane but I can adjust one of the two values slightly if that helps.