Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Review of Macroscopic Motion in Thermodynamic Equilibrium   A principle on the macroscopic motion of systems in thermodynamic
equilibrium, rarely discussed in texts, is reviewed: Very small but still
macroscopic parts of a fully isolated system in thermal equilibrium move as if
points of a rigid body, macroscopic energy being dissipated to increase
internal energy, and increase entropy along. It appears particularly important
in Space physics, when dissipation involves long-range fields at
Electromagnetism and Gravitation, rather than short-range contact forces. It is
shown how new physics, Special Relativity as regards Electromagnetism, first
Newtonian theory then General Relativity as regards Gravitation, determine
different dissipative processes involved in the approach to that equilibrium.

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The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
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The categories of this paper are: eess