p / ρ = constant (1) where Many compressed gas cylinders are stored at extremely high pressures (up to 2,500 pounds per square inch gauge or PSIG). Any material that’s under pressure can be dangerous if it’s not handled properly. If compression or expansion of gas takes place under constant temperature conditions - the process is said to be isothermal. Gases can be compressed, because they just take up the space surrounding them. If the material is a compressed gas, it may be flammable, explosive, reactive, toxic or a combination of these. However they can bear isotropic compression, and may be compressed in other ways momentarily, for instance in a sound wave. The attractive forces between the particles in a gas are very weak, so the particles are free to move in random direction. Compressed means that by applying a pressure (force per unit area) or a Force its volume deceases. Compressed gas cylinders present numerous hazards and can contain gases that are: • Flammable or combustible • Explosive • Corrosive •Poisonous. Compressed gas cylinders are used in many workplaces to store gases that vary from extremely flammable (acetylene) to inert (helium). Never rely on the color of the cylinder for identification. Cylinders have been known to penetrate concrete-block walls. Many compressed gas cylinders are stored at extremely high pressures (up to 2,500 pounds per square inch gauge or PSIG). When gas is compressed, the particles are forced much closer together, allowing a huge amount of particles to fit in a small space. Liquid can generally be assumed to be incompressible as there volumes do not alter that much, whilst for solids it is generally taken that there volume do not alter at all when pressure is applied. They just move along until they collide, either with … • Never attempt to repair a cylinder or valve Compressed Gas Cylinder Safety Precautions. Gas cylinders must be clearly identified. Gases can be compressed easily because there is a large amount of space between the individual molecules, which are very active and move around at high speed. The isothermal process can be expressed with the Ideal Gas Law as. extremely inert (helium). They cannot be compressed (squashed) The particles are close together and have no space to move into Liquids are useful in car brake systems because they flow and cannot be compressed. isothermal, isentropic (adiabatic) polytropic; Isothermal Compression/Expansion Processes. The process can be. The particles in a gas move quickly in all directions, but they do not get far before they bump into each other or the walls of their container. Gas Cylinder Storage and Handling: General Requirements. Liquids and gases cannot bear steady uniaxial or biaxial compression, they will deform promptly and permanently and will not offer any permanent reaction force. Compressed Gases. 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