The axisymmetric shape of a pore resulting from a bubble trapped by a solidification front is experimentally and theoretically investigated. Accounting for momentum, energy, mass, and species transport and physico-chemical equilibrium at the moving cap surface of the pore and introducing a time-dependent mass transfer coefficient derived from a scale analysis, the results find the effects of dimensionless parameters governing mass transfer coefficient, the maximum and decaying rate of displacement of the solidification front, Henry＇s constant, concentration in bulk liquid, surface tension, and cap angle on the shape of the pore. Comparisons between the computed and measured variations in the pore length and cap radius with time are also presented.