Minecraft wiki entry for Sponge, associated text: A sponge can be used to turn water into air by "absorbing" the water. A sponge instantly absorbs nearby water when it is placed next to water or when water comes into contact with it. Sponges immediately turn wet upon absorption and do not absorb any more water afterwards. Wet sponges drip small water particles. Sponges in item form do not absorb water or become wet.