  We study the limiting behavior of the solutions of Euler equations of
one-dimensional compressible fluid flow as the pressure like term vanishes.
This system can be thought of as an approximation for the one dimensional model
for large scale structure formation of universe. We show that the solutions of
former equation converges to the solution of later in the sense of distribution
and agrees with the vanishing viscosity limit when the initial data is of
Riemann type. A different approximation for the one dimensional model for large
scale structure formation of universe is also studied.
