Abstract: A handy pump has a head and a body. A display window is disposed on an outer circumference of the head to surround the head. A light-guide plate is disposed to guide light from a light source to the display window. The light source is controlled to display operating states of the handy pump. A clearance and a clearance for ventilation are defined within a guide cap when the guide cap is placed to cover a plug and a container. The handy pump discharges air downwardly from inside of the guide cap along the outside of the plug and the container.

Abstract: Molecular sieve carbon fibers capable of separating and purifying nitrogen from air in large quantities are provided. The carbon fibers have diameters of 5 to 50 .mu.m and micropores opening directly at the surface of the carbon fibers with pore sizes of 0.5 nm or less. They are capable of separating nitrogen at a purity of 98% or higher, even 99.9% or higher from air, etc., with a relatively low adsorbing pressure and deadsorbing vacuum. The molecular sieve carbon fibers do not deteriorate during operation since they are resistant to division or powdering and the adsorbing pressure and deadsorbing vacuum are relatively low.