Talk:Tetrafluoroethylene
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If pressurised TFE is allowed into a vessel/pipework at a lower pressure the heat generated from compression may be sufficient to ignite the TFE, causing explosion/explosive decomposition.
editPressurised gas into a lower pressure vessel would be decompression, which is usually an endothermic process.
I have heard that hydrogen cylinders can ignite if the valve on the cylinder is directly cracked open; praxair mention it 'spontaneously igniting'. I have never read an explaination for why this might occur or if it is indeed simply due to the pressure change; BOC, for instance, do not mention 'spontaneous ignition', only that it is easily ignited. If spontaneous ignition does occur, I can only assume it is due to the drag generated heat within the valve body as the gas leaves at such a high velocity. — Preceding unsigned comment added by 109.152.24.5 (talk) 22:18, 1 February 2012 (UTC)
Helium and hydrogen are two gases whose Joule–Thomson inversion temperatures at a pressure of one atmosphere are very low (e.g., about 51 K (−222 °C) for helium). Thus, helium and hydrogen warm up when expanded at constant enthalpy at typical room temperatures. On the other hand nitrogen and oxygen, the two most abundant gases in air, have inversion temperatures of 621 K (348 °C) and 764 K (491 °C) respectively: these gases can be cooled from room temperature by the Joule–Thomson effect — Preceding unsigned comment added by 98.197.0.206 (talk) 01:54, 20 February 2014 (UTC)
On the 3D model of tetrafluoroethylene
editIsn't fluorine used to be yellowish-green in a 3D model? It's blue in the model here. Zhieaanm (talk) 03:55, 13 December 2008 (UTC)
Name
editWouldn't using the systematic IUPAC name make more sense as this is in no way an everyday substance and therefore the grounds for keeping the old name seem weak.
Structure Diagram
editWhy not have a structure diagram that makes it clear that there are C's double bonded in the middle? You can see the C's in the 3D model but they're not labeled as such, and the line drawing is rather unclear. ironmagma (talk) 16:49, 12 February 2012 (UTC)