Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Isotope velocimetry: Experimental and theoretical demonstration of the
  potential importance of gas flow for isotope fractionation during evaporation
  of protoplanetary material   We use new experiments and a theoretical analysis of the results to show that
the isotopic fractionation associated with laser-heating aerodynamic levitation
experiments is consistent with the velocity of flowing gas as the primary
control on the fractionation. The new Fe and Mg isotope data are well explained
where the gas is treated as a low-viscosity fluid that flows around the molten
spheres with high Reynolds numbers and minimal drag. A relationship between the
ratio of headwind velocity to thermal velocity and saturation is obtained on
the basis of this analysis. The recognition that it is the ratio of flow
velocity to thermal velocity that controls fractionation allows for
extrapolation to other environments in which molten rock encounters gas with
appreciable headwinds. In this way, in some circumstances, the degree of
isotope fractionation attending evaporation is as much a velocimeter as it is a
barometer.

0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
2
The categories of this paper are: math
30
The categories of this paper are: q-alg