Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Liquid jet rebound upon impact on a soft gel   A liquid jet can stably bounce off a sufficiently soft gel, by following the
contour of the dimple created upon impact. This new phenomenon is insensitive
to the wetting properties of the gels and was observed for different liquids
over a wide range of surface tensions, $\gamma$ = 24--72 mN/m. In contrast,
other jet rebound phenomena are typically sensitive to $\gamma$: jet rebounds
off a hard solid (e.g. superhydrophobic surface) or another liquid are possible
only for high and low $\gamma$ liquids, respectively. This is because an air
layer must be stabilized between the two interfaces. For a soft gel, no air
layer is necessary and jet rebound remains stable even when there is direct
liquid-gel contact.

29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph