Mechanical Engineering Exam > Mechanical Engineering Questions > A gas having a negative Joule-Thomson coeffic...
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A gas having a negative Joule-Thomson coefficient ( μj < 0), when throttled, will
- a)become cooler
- b)become warmer
- c)first become cooler and then warmer
- d)either be cooler or warmer depending on the type of gas
Correct answer is option 'B'. Can you explain this answer?
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A gas having a negative Joule-Thomson coefficient ( μj< 0), when...
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A gas having a negative Joule-Thomson coefficient ( μj< 0), when...
The Joule-Thomson coefficient is a measure of how the temperature of a gas changes when it undergoes a throttling process, such as passing through a valve or an orifice. A positive Joule-Thomson coefficient indicates that the gas cools down when it expands, while a negative Joule-Thomson coefficient indicates that the gas heats up when it expands.
In reality, most gases have positive Joule-Thomson coefficients. This means that when a gas expands, it tends to cool down. However, there are some gases that have negative Joule-Thomson coefficients, meaning they heat up when they expand.
One example of a gas with a negative Joule-Thomson coefficient is carbon dioxide (CO2) at high pressures. When high-pressure carbon dioxide is released into a lower-pressure environment, it actually heats up instead of cooling down. This is why carbon dioxide fire extinguishers can be used to extinguish certain types of fires, as the heated gas can displace oxygen and smother the fire.
Other gases, such as hydrogen and helium, also have negative Joule-Thomson coefficients at certain temperatures and pressures. However, these gases are usually not encountered in everyday situations.
In reality, most gases have positive Joule-Thomson coefficients. This means that when a gas expands, it tends to cool down. However, there are some gases that have negative Joule-Thomson coefficients, meaning they heat up when they expand.
One example of a gas with a negative Joule-Thomson coefficient is carbon dioxide (CO2) at high pressures. When high-pressure carbon dioxide is released into a lower-pressure environment, it actually heats up instead of cooling down. This is why carbon dioxide fire extinguishers can be used to extinguish certain types of fires, as the heated gas can displace oxygen and smother the fire.
Other gases, such as hydrogen and helium, also have negative Joule-Thomson coefficients at certain temperatures and pressures. However, these gases are usually not encountered in everyday situations.
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A gas having a negative Joule-Thomson coefficient ( μj< 0), when throttled, willa)become coolerb)become warmerc)first become cooler and then warmerd)either be cooler or warmer depending on the type of gasCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A gas having a negative Joule-Thomson coefficient ( μj< 0), when throttled, willa)become coolerb)become warmerc)first become cooler and then warmerd)either be cooler or warmer depending on the type of gasCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A gas having a negative Joule-Thomson coefficient ( μj< 0), when throttled, willa)become coolerb)become warmerc)first become cooler and then warmerd)either be cooler or warmer depending on the type of gasCorrect answer is option 'B'. Can you explain this answer?.
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