# No Market For Avocado Oil?

**URL:** <https://boards.straightdope.com/t/no-market-for-avocado-oil/635400>\
**Category:** Cecil's Columns/Staff Reports\
**Created:** [September 21, 2012, 3:11pm UTC](https://boards.straightdope.com/t/no-market-for-avocado-oil/635400 "2012-09-21T15:11:09Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![Irishman](https://avatars.discourse-cdn.com/v4/letter/i/b487fb/32.png) [@Irishman](https://boards.straightdope.com/u/Irishman)\
**Post date:** [September 27, 2012, 9:37pm UTC](https://boards.straightdope.com/t/no-market-for-avocado-oil/635400/21 "2012-09-27T21:37:52Z")

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> [@MikeF](#):
>
> Regarding puckering vs. open mouth huffing - I thinks its wind chill effect. Unless you consciously slow your inhalation, you are drawing the same volumes of air in through the small pucker hole as the open mouth over the same period of time. Therefore, the air must be moving faster - higher wind chill.

Not so. First off, I generally measure _ex_halation, not inhalation. Second, I can regulate the exhale to a very small trickle through my pursed lips, and it will be dramatically cooler than a hard exhale with mouth wide open.

I suspect that there’s something related to the venturi effect going on, that the air compresses going through the pursed lips, and expands as it exits the “nozzle”. I know Cecil disputes this, but the feels like temp is dramatically different, regardless of airflow. It’s about pursing vs not pursing rather than exhalation power.

I am temped to dig up a thermocouple and try to measure the output.

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**Author:** ![gnoitall](https://avatars.discourse-cdn.com/v4/letter/g/bb73d2/32.png) [@gnoitall](https://boards.straightdope.com/u/gnoitall)\
**Post date:** [September 27, 2012, 10:35pm UTC](https://boards.straightdope.com/t/no-market-for-avocado-oil/635400/22 "2012-09-27T22:35:41Z")

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> [@Irishman](#):
>
> Not so. First off, I generally measure _ex_halation, not inhalation. Second, I can regulate the exhale to a very small trickle through my pursed lips, and it will be dramatically cooler than a hard exhale with mouth wide open.
> 
> I suspect that there’s something related to the venturi effect going on, that the air compresses going through the pursed lips, and expands as it exits the “nozzle”. I know Cecil disputes this, but the feels like temp is dramatically different, regardless of airflow. It’s about pursing vs not pursing rather than exhalation power.
> 
> I am temped to dig up a thermocouple and try to measure the output.

That would be a fascinating experiment. Using a dry thermometer would eliminate evaporative cooling effects, something skin is particularly susceptible to and a possible source of the perceived cooling you mention.

Of course, exhalation isn’t dry either… so I wonder of exhaled water vapor would make a difference in the two air jets?

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