Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU.
A. 180
B. 970
C. 3.97
D. None of these
Answer: Option A
This Question Belongs to Chemical Engineering >> Heat Transfer
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Fqra cold viscous feed, backward feed gives __________ than forward feed.
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The correct answer is:
B. 970
Explanation:
Latent heat of vaporization is the amount of heat required to convert a liquid into vapor without a change in temperature.
For water at 212°F (100°C) and standard atmospheric pressure:
The latent heat of vaporization ≈ 970 BTU/lb
This is the heat required to convert 1 lb of water at 212°F into 1 lb of steam at 212°F.
Other Options:
A. 180 BTU → This is the sensible heat to raise water from 32°F to 212°F.
C. 3.97 BTU → Irrelevant value.
D. None of these → Incorrect, since B is valid.
✅ Final Answer: B. 970
The latent heat of vaporization (also known as enthalpy of vaporization) for water at atmospheric pressure (212°F) is approximately 970 BTU per pound. so Answer is B