PermalinkSubmitted by Anonymous (not verified) on Tue, 01/05/2018 - 08:24
When you blow air out of your mouth in a large O shape, you feel it as hot. When you purse your lips and you make the volume of your mouth smaller, the air moves from a smaller volume to a bigger volume. Since gas expanded form a smaller to a larger volume, the gas cools down from the 1st law of thermodynamics, and you feel it as cold.
PermalinkSubmitted by Dr. Samuel Klemens (not verified) on Fri, 01/11/2019 - 03:03
Err, chris, do you mean that Anonymous is incorrect? Actually, Anonymous is correct. He/she is actually more accurate than the explanation provided in the site.
PermalinkSubmitted by Kritee S Bisht (not verified) on Thu, 03/08/2017 - 01:28
If friction also acts in open mouth case , then why doesn't it acts in tightened mouth case and makes it hotter , in which the friction should be more making air hotter than open mouth case ? Pls. Answer my diellima
PermalinkSubmitted by Kem Eng (not verified) on Wed, 28/06/2017 - 00:24
Test this hypothesis by repeating the different mouth blowing techniques in ambient temperatures that are similar to the body's temperature. That is the entrained air stream has an identical temperature to the air leaving the mouth.
Evaporation of the air stream leaving the mouth is also related to the nature of the air flow. The open mouth stream is less turbulent and perhaps even near laminar flow which reduces the evaporation of moisture from the breath air to the surrounding room air.
If you can verify the effect of room temperature on the air entrainment influence on the skin sensation of heat/cold then the effect of evaporative cooing of the air stream cpdriven by turbulence can be determined.
Comments
this was a great experiment
this was a great experiment
Thanks for this, I was
Thanks for this, I was thinking about this for months.
Thank u so much
Thank u so much
When you blow air out of your
When you blow air out of your mouth in a large O shape, you feel it as hot. When you purse your lips and you make the volume of your mouth smaller, the air moves from a smaller volume to a bigger volume. Since gas expanded form a smaller to a larger volume, the gas cools down from the 1st law of thermodynamics, and you feel it as cold.
No, that's not the
No, that's not the explanation. It's a good thought, but it's not right. What is written above is the correct answer.
Err, chris, do you mean that
Err, chris, do you mean that Anonymous is incorrect? Actually, Anonymous is correct. He/she is actually more accurate than the explanation provided in the site.
If friction also acts in open
If friction also acts in open mouth case , then why doesn't it acts in tightened mouth case and makes it hotter , in which the friction should be more making air hotter than open mouth case ? Pls. Answer my diellima
Test this hypothesis by
Test this hypothesis by repeating the different mouth blowing techniques in ambient temperatures that are similar to the body's temperature. That is the entrained air stream has an identical temperature to the air leaving the mouth.
Evaporation of the air stream leaving the mouth is also related to the nature of the air flow. The open mouth stream is less turbulent and perhaps even near laminar flow which reduces the evaporation of moisture from the breath air to the surrounding room air.
If you can verify the effect of room temperature on the air entrainment influence on the skin sensation of heat/cold then the effect of evaporative cooing of the air stream cpdriven by turbulence can be determined.
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