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Compressed air coming out from a punctured football

This question belongs to Mechanical Engineering Engineering Thermodynamics
Engineering Thermodynamics
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Compressed air coming out from a punctured football

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Correct Answer: Option B
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2 Comments
Salahuddin Kv
Salahuddin Kv 7 years ago
It is due to throttling..
In ideal gases temp is const after throttling ..
However ..in this case , air becomes cooler after throttling ..
Shubham Gaurav
Shubham Gaurav 8 years ago
When air is coming out of punctured football, puncture acts like a nozzle. when fluid is passed through nozzle, velocity increases and pressure decreases, resulting in decrease of temperature.

You can observe this phenomenon by keeping your hand near mouth and blowing.

Case 1. Keep your mouth wide open and blow the air

Case 2. Open your mouth little and blow.

In case 2, you will feel air much cool. Here mouth is acting like a nozzle.
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