Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: In favour of the time variable in classical thermoDYNAMICS   A case for the teaching of classical thermodynamics with an explicit time
variable, with phenomena involving changes in time, is made by presenting and
solving a exercise in textbook style, and pointing out that a solution accords
with experiment. The exercise requires an explicit treatment of the time
variable. Further arguments are given for the advantages of an explicit time
variable in classical thermodynamics, and against some standard terminology in
this theory.

5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th