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In thermodynamics, the enthalpy of sublimation, or heat of sublimation, is the heat required to sublimate (change from solid to gas) one mole of a substance at a given combination of temperature and pressure, usually standard temperature and pressure (STP). It is equal to the cohesive energy of the solid.
Solid carbon dioxide sublimes rapidly along the solid-gas boundary (sublimation point) below the triple point (e.g., at the temperature of −78.5 °C, at atmospheric pressure), whereas its melting into liquid CO 2 can occur along the solid-liquid boundary (melting point) at pressures and temperatures above the triple point (i.e., 5.1 atm, − ...
The most common dyes used for sublimation activate at 350 degrees Fahrenheit / 175 degrees Celsius. However, a range of 380 to 420 degrees Fahrenheit / 195 to 215 degrees Celsius is normally recommended for optimal color. The result of the sublimation transfer process is a nearly permanent, high-resolution, full-color print.
The form of the cooled surface often is a so-called cold finger which for very low-temperature sublimation may actually be cryogenically cooled. If the operation is a batch process , then the sublimed material can be collected from the cooled surface once heating ceases and the vacuum is released.
Outgassing is a possible source of many tenuous atmospheres of terrestrial planets or moons. [6] Many materials are volatile relative to the extreme vacuum of outer space, and may evaporate or even boil at ambient temperature.
Instead of being able to calmly focus on her chemotherapy treatment, Arete Tsoukalas had to spend hours on the phone arguing with her insurer while receiving infusions in the hospital. Diagnosed ...
From January 2008 to December 2012, if you bought shares in companies when Thomas J. Wilson joined the board, and sold them when he left, you would have a -23.1 percent return on your investment, compared to a -2.8 percent return from the S&P 500.
From January 2008 to December 2012, if you bought shares in companies when Johnathan A. Rodgers joined the board, and sold them when he left, you would have a 18.2 percent return on your investment, compared to a -2.8 percent return from the S&P 500.
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