Method of feeding a predetermined amount of powder, apparatus therefor and package used therein

A method and an apparatus for feeding a predetermined amount of powder are disclosed. These method and apparatus are based on an idea to handle the powder in the pseudo-agglomerated state. The feeding method comprises the steps of: incorporating the powder (P) into a tubular member (1) which is equiped with a piston (2) slidably movable in said tubular member; advancing the piston (2) to extrude the powder (P) out of the tubular member (1) in a pseudo-agglomerated state; and separating the extruded powder from the cylinder. On the other hand, the powder feeding apparatus comprises an open ended tubular member (1), a piston (2) slidably mounted in the tubular member, a cutting means (6) mounted at the top opening of the tubular member. According to these method and apparatus, feeding or weighing of powder can be conducted with precise accuracy without causing the classification of particles nor making a dust. The automatization of the working in the laboratory or factory can be easily realized with these method and apparatus. A package for powder used preferable in conducting the above method is also disclosed.