How to Calculate Humidity in an Airtight Vessel?

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SUMMARY

The discussion centers on calculating the internal pressure required in a 1m³ airtight vessel to achieve a temperature of 45°C and 75% relative humidity. To determine the partial pressure of water vapor at these conditions, one must first establish the mass or moles of water vapor present in the air. The user seeks guidance on the initial steps necessary to calculate these values, emphasizing the relationship between temperature, pressure, and water vapor content.

PREREQUISITES
  • Understanding of the Ideal Gas Law
  • Knowledge of psychrometric principles
  • Familiarity with vapor pressure tables for water
  • Basic thermodynamics concepts
NEXT STEPS
  • Study the Ideal Gas Law and its application in humidity calculations
  • Research psychrometric charts to understand the relationship between temperature, pressure, and humidity
  • Learn how to use vapor pressure tables for water at various temperatures
  • Explore methods for calculating partial pressure of gases in a mixture
USEFUL FOR

Students in thermodynamics, engineers working with HVAC systems, and anyone involved in humidity control in sealed environments.

mahler.ji
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Hello,

This is my first post on here, so thank you in advance for your help.


Homework Statement



I have an air tight vessel that has a volume of 1m^3. The bottom of the vessel has water in it. What internal pressure is needed inside the vessel to achieve a temperature of 45C and 75% Relative Humidity? Also, what is the partial pressure of water vapor at that condition?


Homework Equations



None Given.

The Attempt at a Solution



I can't figure out how to figure out the mass/moles of water vapor in the air in order to figure out partial pressure and, thus, the relative humidity. I can't figure out how to get the overall pressure without knowing the mass/moles of water vapor in the air either. So I just need to know how to get started and i think I can finish it.


again, thanks for your help.
 
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Anyone have any ideas at all?

I think the real question is, based on Temperature and Pressure, how do I know how much water is in the air??

Thanks,
 

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