Re: Re:
mumuka said:
Anyone has any idea why there was no tingling sensation when i mixed peppermint oil in jojoba oil? Armando ? Anyone?
yay! a simple chemistry question!
Ethanol evaporates fast. And when mixed with water, the water evaporates fast too. That is the tricomin. Oil does not evaporate fast.
When you have a cup of water at 70 degrees, that just means the average temp is 70. The molecules actually have a bell curve of temperatures, some of which are at 212 degrees. Those ones evaporate. Boiling is just fast evaporation, where even molecules in the middle turn to gas. When the hottest molecules leave, the average temperature of those remaining is reduced. That is how evaporative cooling works. The faster something evaporates, the faster the heat can leave, which is why alcohol feels so cool on your skin.
So that is why the oil does not feel cool.
As for the peppermint, I bet it stimulates circulation near the surface somehow. Irritation or something, I don't know. Probably not irritation, but circulation near the surface. More blood near the surface means more heat leaves your scalp to the liquid. So your scalp cools even faster because you lose all that heat.
Your body senses the difference between skin temp and outside temp, which is why you feel cold when you have a fever. But if you were exposed to just cool air, the air right next to your head would heat up, and be caught by your hair, and you'd feel warmer with your blood vessels near the surface. But because your scalp is touching quickly evaporating fluid, which is denser and has a higher heat capacity, you get cooled down faster. It's like the difference between jumping in 60 degree water or 60 degree air.