Agreed, I’m referencing static pressure. Maintaining such a high pressure while blowing requires pursing your lips tightly to severely limit the flow rate. A small but non-zero flow rate should still allow a person to produce something very close to this static pressure.
This is what I’ve been saying.
If you’ll purchase an anemometer and ship it to The wind of my soul, she can report back with airspeed measurements under the circumstances about which she was inquiring in her OP. From that, we’ll be able to back-calculate respiratory tract pressure, and estimate an absolute upper bound for adiabatic temperature drop.
Absent any real data obtained thusly, I’ll claim that we’re probably talking about a pressure of just a few inches of water, resulting in a potential temperature change of perhaps 1-2 degrees F. And I will stand by my claim that this temperature drop is largely canceled out by the earlier temperature increase that was incurred when pressurizing the respiratory tract to begin blowing.
Do let me know if you think my claims are in error.
If you’re looking for a demonstration rather than a claim, try this:
Position the back of your hand six inches from your mouth, and blow. Assuming you’re in a room that’s about 70F, you will observe a cooling effect.
Now continue blowing at the same rate, and gradually move your hand closer to your mouth until until your lips are almost touching the back of your hand. Your hand should actually feel slightly warm doing this. With your lips this close to your hand, you’ve eliminated entrainment of cool, dry ambient air, and now all of the air impinging on that one spot is coming from your lips - nice, humid, warm air that transfers heat to the back of your hand and eliminates the evaporative cooling effect from any sweat that may be present. This demonstrates that entrainment of cool, dry ambient air is the dominant factor in the cooling effect observed under the typical circumstances in which one blows on one’s skin.