A scientific phenomena evaluation device comprising a base plate in which a plurality of long grooves having sectional areas of 1 mm.sup.2 or less are formed in a surface; and a cover plate that is bonded to the surface of the base plate and covers the long grooves to form a plurality of minute channels in the base plate, wherein one ends of the plurality of channels merge at one merging point, and the other ends of the plurality of channels communicate with reservoirs having capacities of 5 to 5000 mm.sup.3, one or more of the reservoirs are formed to house an absorption device, and scientific phenomena in the channels are visually perceivable.