80-XX	Classical thermodynamics, heat transfer {For thermodynamics of solids, see 74A15}
80-00	General reference works (handbooks, dictionaries, bibliographies, etc.)
80-01	Instructional exposition (textbooks, tutorial papers, etc.)
80-02	Research exposition (monographs, survey articles)
80-03	Historical {!must also be assigned at least one classification number from section 01}
80-04	Explicit machine computation and programs (not the theory of computation or programming)
80-05	Experimental work
80-06	Proceedings, conferences, collections, etc.
80Axx	Thermodynamics and heat transfer
80A05	Foundations
80A10	Classical thermodynamics, including relativistic
80A17	Thermodynamics of continua [See also 74A15]
80A20	Heat and mass transfer, heat flow
80A22	Stefan problems, phase changes, etc. [See also 74Nxx]
80A23	Inverse problems
80A25	Combustion
80A30	Chemical kinetics [See also 76V05, 92C45, 92E20]
80A32	Chemically reacting flows [See also 92C45, 92E20]
80A50	Chemistry (general) [See mainly 92Exx]
80A99	None of the above, but in this section
80Mxx	Basic methods
80M10	Finite element methods
80M15	Boundary element methods
80M20	Finite difference methods
80M25	Other numerical methods
80M30	Variational methods
80M35	Asymptotic analysis
80M40	Homogenization
80M50	Optimization
80M99	None of the above, but in this section