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The triple point on the phase diagram corresponds to the melting point (−80.8 °C) at the minimal pressure at which liquid acetylene can exist (1.27 atm). At temperatures below the triple point, solid acetylene can change directly to the vapour (gas) by sublimation. The sublimation point at atmospheric pressure is −84.0 °C. [30]
A typical phase diagram.The solid green line applies to most substances; the dashed green line gives the anomalous behavior of water. In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. [1]
Where data points are unavailable for 25 °C or 1 atmosphere, values are given at a nearby temperature/pressure. ... Acetylene: C 2 H 2: 10.2 T = 20 °C [9] Ethylene:
Acetylene is also supplied differently. Since it is so unstable and explosive, this is supplied as a gas dissolved in acetone within a packing mass in a cylinder. Acetylene is also the only other common industrial gas that sublimes at atmospheric pressure. [30]
A gas cylinder is a pressure vessel for storage and containment of gases at above atmospheric pressure. ... Acetylene: 510 Air, breathing: 346, 347 Air, industrial: 590
Mars has a very thin atmosphere – the pressure is only 1 ⁄ 160 of earth atmospheric pressure – so a huge balloon would be needed even for a tiny lifting effect. Overcoming the weight of such a balloon would be difficult, but several proposals to explore Mars with balloons have been made. [15] Venus has a CO 2 atmosphere.
It can be used at a higher pressure than acetylene and is therefore useful for underwater welding and cutting. It is a good type of flame to use when heating large amounts of material. The flame temperature is high, about 2,000 °C for hydrogen gas in air at atmospheric pressure, [ 11 ] and up to 2800 °C when pre-mixed in a 2:1 ratio with pure ...
Higher temperature or pressure, as well as higher concentration of the oxidizer (primarily oxygen in air), results in lower LFL and higher UFL, hence the gas mixture will be easier to explode. Usually atmospheric air supplies the oxygen for combustion, and limits assume the normal concentration of oxygen in air.