How to Identify the Phase of Steam Using a Thermodynamics Table?

AI Thread Summary
To determine the phase of steam at 110°C and 55.732 kPa using the A-4 Table, it is established that the saturation pressure at this temperature is 143.38 kPa. Since the pressure is lower than the saturation pressure, the steam is classified as superheated vapor. The discussion highlights the importance of understanding the relationship between temperature and pressure to identify the phase accurately. If the pressure were equal to the saturation pressure, the phase could be either saturated liquid, saturated vapor, or a saturated mixture, requiring additional data for clarification. Overall, the key takeaway is that lower pressure at a given temperature indicates superheated conditions.
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Homework Statement

[/B]
Determine the phase of the steam (compress liquid, saturated liquid, saturation mixture, saturated vapor, superheated vapor, or supercritical vapor). Use A-4 Table.

T=110 Celsius
P=55.732 kPa

Homework Equations


A-4 Table: http://che31.weebly.com/uploads/3/7/4/3/3743741/handout_g1-saturatedwater-temperature.pdf

The Attempt at a Solution


[/B]
From A-4 Table, Saturated Water at 110 Celsius got 143.38 kPa. For the problem it has same temperature, but lower pressure. So it means it's superheated vapor, right?

what I want to know is, how am I supposed to tell it's whether saturated water, saturated mixture or saturated vapor. or even supercritical vapor.

Like, if the problem was to determine phase at T=110 Celsius and P=143.38kPa, should it be saturated liquid or saturated mixture?
 
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dhkdeoen said:

Homework Statement

[/B]
Determine the phase of the steam (compress liquid, saturated liquid, saturation mixture, saturated vapor, superheated vapor, or supercritical vapor). Use A-4 Table.

T=110 Celsius
P=55.732 kPa

Homework Equations


A-4 Table: http://che31.weebly.com/uploads/3/7/4/3/3743741/handout_g1-saturatedwater-temperature.pdf

The Attempt at a Solution


[/B]
From A-4 Table, Saturated Water at 110 Celsius got 143.38 kPa. For the problem it has same temperature, but lower pressure. So it means it's superheated vapor, right?
Right.
what I want to know is, how am I supposed to tell it's whether saturated water, saturated mixture or saturated vapor. or even supercritical vapor.
Well, in this problem, the only choices are superheated vapor or supercritical vapor. You know it's not supercritical vapor, because the temperature is not above the critical temperature.
Like, if the problem was to determine phase at T=110 Celsius and P=143.38kPa, should it be saturated liquid or saturated mixture?
From the information provided, it can be either saturated liquid, saturated vapor, or a saturated mixture. To resolve this, you would need more information, like the macroscopic density of the mixture.

Chet
 
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