Substance evaporation temperature

In summary, "substance evaporation temperature" refers to the temperature at which a substance changes from a liquid to a gas state. It is determined by the strength of intermolecular forces and can change depending on factors such as pressure and impurities. It is not the same as the melting point, and affects the substance's volatility - a lower evaporation temperature indicates higher volatility.
  • #1
indianaronald
21
0
Can a substance only evaporate at the T(sat) at that particular pressure and why not even at a higher temperature?
Example of a refrigerant at room temperature, pressurized container. But when it's opened, the P falls and T(sat) falls, so it goes to that T(sat) temperature to evaporate. But why? Why not evaporate at the room temperature itself?
 
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  • #2
Evaporation reduces the temperature of the surface until you have an equilibrium (or something close to it) at the surface.
 

1. What is "substance evaporation temperature"?

"Substance evaporation temperature" refers to the temperature at which a substance changes from a liquid state to a gas state, or evaporates. This is also known as the boiling point of a substance.

2. How is the substance evaporation temperature determined?

The substance evaporation temperature is determined by the strength of the intermolecular forces between the particles in the substance. The stronger the forces, the higher the evaporation temperature will be.

3. Can the substance evaporation temperature change?

Yes, the substance evaporation temperature can change depending on factors such as atmospheric pressure, presence of impurities, and the physical state of the substance (solid, liquid, or gas).

4. Is the substance evaporation temperature the same as the melting point?

No, the substance evaporation temperature and melting point are not the same. The melting point is the temperature at which a substance changes from a solid to a liquid state, while the evaporation temperature is the temperature at which a substance changes from a liquid to a gas state.

5. How does the substance evaporation temperature affect its volatility?

The substance evaporation temperature is directly related to the volatility of a substance. A substance with a lower evaporation temperature is considered more volatile, meaning it is more likely to evaporate at a lower temperature compared to a substance with a higher evaporation temperature.

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