Gas cylinder pneumatics is a pneumatic weapon in which the flow of the working fluid ( gas ) comes from an isolated tank (storage), into which the working fluid is pre-pumped by a compressor (pump) or comes from another tank.
Thus, in this class, in addition to devices having a gas cylinder (reservoir) in their construction, also include pneumatics and pneumatic cartridges .
When injecting gas from a cylinder, not only air or CO 2 can be used. The use of gases with a higher speed of sound allows you to increase the power of the shot. It is mainly used for sports and recreational shooting.
Device
Carbon dioxide at normal temperature is in a gas cylinder in liquid form, a vapor cushion is located above the liquid level, the CO 2 pressure in the cylinder is 50 atmospheres. This pressure is kept constant until at least a little liquid carbon dioxide remains at the bottom of the cylinder. The vapor phase pressure depends on the ambient temperature, at a very low temperature its decrease is noted (see phase transition ).
Compressed gas (air)
In a pneumatic weapon , the potential energy of a pre-compressed (liquefied) gas is used to eject a bullet or the gas is compressed at the moment of a shot. Here, the generic term "gas" includes air, carbon dioxide, nitrogen, and gas mixtures. When fired, the gas expands, which, acting on the bullet, gives it kinetic energy. The amount of energy transferred, and, therefore, the speed of the bullet depends on many factors, including: the ratio of the mass of the bullet and the mass of compressed air; the value of the speed of sound in air - which in turn depends on temperature, the characteristics of the adiabatic process, and the efficiency of the entire system.