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We examine spherical gravitational collapse of a matter model with vanishingradial pressure and non-zero tangential pressure. It is seen analytically thatthe collapsing cloud either forms a black hole or disperses depending on valuesof the initial parameters which are initial density, tangential pressure andvelocity profile of the cloud. A threshold of black hole formation is observednear which a scaling relation is obtained for the mass of black hole, assuminginitial profiles to be smooth. The similarities in the behaviour of this modelat the onset of black hole formation with that of numerical critical behaviourin other collapse models are indicated.Comment: 15 pages, To be published in Gen.Rel.Gra

Rebounce and black hole formation in a gravitational collapse model with vanishing radial pressure