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I didn't have the energy to say the above earlier, but yes that's exactly why it didn't make sense to me. You're not really "essentially evaporating" the animal by scraping off the water... It's not water coming off the animal that cools it down. It's the transfer of body heat to the water causing it to evaporate (the vaporization of water), that cools it down. If I remember correctly, of conduction, convection and evaporation, evaporation takes the win every time. Which is part of the reason why you pour alcohol on animals that are in heat shock (low bp fluid). But then again, the earth revolves differently for horse people (gravity, science, evaporation, puh puh!), so perhaps this is one of those things 🙂. Whatever your horse likes I guess, as long as it's helping to cool them down so they're not overheating!
I wonder if there's any other reason why it might be beneficial to scrape the horse though, other than that it'll dry off faster.
Interesting. Shows how much I learned in physics. I just think of it as the heat from the horse's body transfers to the water (since the horse's body is warmer than the water), you scrape that water (and thus the heat) off the horse, add more water which takes more heat, scrape again, add more water, scrape, etc. until the horse is cool. It's always worked for me. I have one particular physics lab in my mind right now that we did my sophomore year of undergrad regarding heat transfer that I just can't remember exactly. That's what I get for taking physics lab at 9 pm.