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In a sample of moist air at saturated atmospheric pressure of 101.325 kPa and 26°C the partial pressure of water vapour is 1.344 kPa. If the saturation pressure of water vapour is 3.36 kPa at 26°C, then what are the humidity ratio and relative humidity of moist air sample?
  • a)
    0.00836 and 1.32%
  • b)
    0.00836 and 40%
  • c)
    0.01344 and 1.32%
  • d)
    0.01344 and 40%
Correct answer is option 'B'. Can you explain this answer?
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In a sample of moist air at saturated atmospheric pressure of 101.325 ...

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In a sample of moist air at saturated atmospheric pressure of 101.325 ...
Given:
- Saturated atmospheric pressure = 101.325 kPa
- Temperature = 26°C
- Partial pressure of water vapour = 1.344 kPa
- Saturation pressure of water vapour at 26°C = 3.36 kPa

To find:
- Humidity ratio
- Relative humidity

Solution:

1. Calculate the vapour pressure deficit (VPD):

VPD = Saturation pressure - Partial pressure of water vapour
VPD = 3.36 kPa - 1.344 kPa
VPD = 2.016 kPa

2. Calculate the humidity ratio:

Humidity ratio = 0.622 x (Partial pressure of water vapour / (Atmospheric pressure - Partial pressure of water vapour))
Humidity ratio = 0.622 x (1.344 kPa / (101.325 kPa - 1.344 kPa))
Humidity ratio = 0.00836 kg/kg

3. Calculate the relative humidity:

Relative humidity = (Partial pressure of water vapour / Saturation pressure) x 100%
Relative humidity = (1.344 kPa / 3.36 kPa) x 100%
Relative humidity = 40%

Therefore, the humidity ratio is 0.00836 kg/kg and the relative humidity is 40%. The correct answer is option B.
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In a sample of moist air at saturated atmospheric pressure of 101.325 kPa and 26°C the partial pressure of water vapour is 1.344 kPa. If the saturation pressure of water vapour is 3.36 kPa at 26°C, then what are the humidity ratio and relative humidity of moist air sample?a)0.00836 and 1.32%b)0.00836 and 40%c)0.01344 and 1.32%d)0.01344 and 40%Correct answer is option 'B'. Can you explain this answer?
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In a sample of moist air at saturated atmospheric pressure of 101.325 kPa and 26°C the partial pressure of water vapour is 1.344 kPa. If the saturation pressure of water vapour is 3.36 kPa at 26°C, then what are the humidity ratio and relative humidity of moist air sample?a)0.00836 and 1.32%b)0.00836 and 40%c)0.01344 and 1.32%d)0.01344 and 40%Correct answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about In a sample of moist air at saturated atmospheric pressure of 101.325 kPa and 26°C the partial pressure of water vapour is 1.344 kPa. If the saturation pressure of water vapour is 3.36 kPa at 26°C, then what are the humidity ratio and relative humidity of moist air sample?a)0.00836 and 1.32%b)0.00836 and 40%c)0.01344 and 1.32%d)0.01344 and 40%Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a sample of moist air at saturated atmospheric pressure of 101.325 kPa and 26°C the partial pressure of water vapour is 1.344 kPa. If the saturation pressure of water vapour is 3.36 kPa at 26°C, then what are the humidity ratio and relative humidity of moist air sample?a)0.00836 and 1.32%b)0.00836 and 40%c)0.01344 and 1.32%d)0.01344 and 40%Correct answer is option 'B'. Can you explain this answer?.
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