sublimation point การใช้

• So the melting point given is really the sublimation point, and note the boiling point is given for a particular high pressure.
• Or the at-89.2C ( cf . sublimation point of CO 2-78C ), would CO 2 precipitate from the air?
• A Phase diagram is a good way to see how the phase varies with temperature and pressure, and how changing those conditions affects the melting / boiling / sublimation point.
• :: : : : : : : Low gravity, leads to low pressure, which leads to a low sublimation point, which leads to a higher vapour pressure.
• Evaporation, regardless of whether it is off a solid or a liquid, occurs at any temperature below the sublimation point, melting point, or boiling point, whichever is applicable at the operating pressure.
• To have something resembling " dry ice " you need to have a substance with a triple point pressure that is higher than the atmospheric pressure and a sublimation point below room temperature ( this second requirement is so that the substance feels cold ).
• For pure carbon, which being only an element, there is no pyrolysis reaction possible, so it " must " be raised above the sublimation point ( ~ 3900K ) to convert it to a gas, wherupon it will burn rapidly.
• That's enough of a difference to drop the sublimation temperature of CO2 by at least a few degrees, meaning that the sublimation point has never been reached in recorded data even there . talk ) 00 : 49, 5 May 2010 ( UTC)
• A couple of the substances in the table, graphite and uranium hexafluoride, have high enough triple point pressures so that they will never be a stable liquid under normal pressure, but their sublimation point is higher ( for graphite much higher ) than room temperature, so I am reluctant to call them " ices " .-- talk ) 12 : 52, 6 May 2008 ( UTC)
• :: Your answer doesn't answer Omegatron's question, but to comment on your answer, I presume you mean " can be heated to a higher temperature than carbon " with respect to oxidation in an oxygen-containing atmosphere, because I know that the melting point of tungsten is lower than the sublimation point of carbon ( carbon doesn't melt at atmospheric pressure, it sublimes directly to the gas phase ).