Wettability is defined as a condition of a solid food surface that determines that how fast a liquid will wet and spread on the surface. Generally, it depends on particle size, density, porosity, surface charge, surface area, surface roughness, surface composition and the surface activity of the food particles (Vega et al., 2005). Among these factors porosity was the primary factor in rehydration potential and surface area and pore size distribution was less important (Farkas and Singh, 1991). For the static wetting test used in this work it can be described as the time that took the water to infiltrate the soursop instant powder and penetrate into the pore system, along with the time for the final immersion of the powder into the liquid. The time the water needs to penetrate completely into a bundle of porous particle is driven by the capillary pressure and can be described by Washburn Eq. (1) (Forny et al., 2011).