Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Progress in Experimental Measurements of the Surface-Surface Casimir
  Force: Electrostatic Calibrations and Limitations to Accuracy   Several new experiments have extended studies of the Casimir force into new
and interesting regimes. This recent work will be briefly reviewed. With this
recent progress, new issues with background electrostatic effects have been
uncovered. The myriad of problems associated with both patch potentials and
electrostatic calibrations are discussed and the remaining open questions are
brought forward.

20
The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: stat
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn