Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On a liquid drop "falling" inside a heavier miscible fluid   We report a new type of drop instability, where the density difference
between the drop and the solvent is negative. We show that the drop falls
inside the solvent down to a minimum height, then fragmentation takes place and
secondary droplets rise up to the surface. We have developed a theoretical
model that captures the essential of the phenomenon and predicts the correct
scalings for the rise-up time and the minimum height.

23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom