298.15 K is 25 C, not 0 (0 is defined to be at 273.15)

Signed-off-by:  <manuel.freire@fdi.ucm.es>
Merge pull request #1641 from manuel-freire/master

298.15 K is 25 C, not 0 (0 is defined to be at 273.15)

#os