Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Influence of Specific Surface Area of Powder on Hydrogen Desorption
  Kinetics for Metal Hydrides   The observable results for desorption kinetics by powder of metal hydride on
the example of mangesium hydride are reproduced with the model formulated in
terms of specific surface of powder. A volumetric measurement of hydrogen
desorption process is evaluated on an example of wet ball milled magnesium
hydride, and can be applied generally for any metal hydride.
  The exact solution of the model reproduces the shape of experimental curves
for desorption process providing a satisfying agreement with experimental data.

16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc