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A pneumatic weapon is a weapon that fires a projectile by means of air pressure, similar in principle to the operation of pneumatic tube delivery systems. The term comes from a Greek word for "wind" or "breath" (πνεῦμα). == Comparison with firearms == In theory, pneumatic weapons have certain advantages over traditional firearms: *The ammunition can be much simpler (and thus more compact and lighter for the same payload), because there is no need for a propellant or casing; the entire round becomes the projectile. *Since no propellant is fired, there is no chemical residue to accumulate in the barrel or chamber. *Because there is no casing to eject, it is theoretically possible to have a higher rate of repeat fire. *The barrel is not heated to nearly the same extent as with a firearm. In practice, pneumatic weapons are not as well-developed as traditional firearms and have a number of practical deficiencies: *The weapon has to supply or be supplied with a source of very high pressure air, such as a reservoir or compressor, which adds substantial complexity and weight to the weapon. *The ''action'', or the mechanism by which subsequent rounds are automatically reloaded, must also be powered by the air pressure; many modern firearms re-use the energy from the propellant to accomplish this (see gas-operated reloading), further reducing the amount of work the weapon itself has to do. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pneumatic weapon」の詳細全文を読む スポンサード リンク
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