Originally Posted by Axxe55
how cold does it have to get for moving water to freeze?
like in a river or stream.
No idea, but it has to be cold. When Cinder and I went camping up in the snowy range next to this stream, my hands turned blue as soon as I stuck them in the water. It felt like the skin was peeled off. All snow melt, but way colder than 32°F. If I had to guess, I'd say it was at least -10°F. I have nothing to judge by for sure though. The coldest temps I've experienced were right about 2°F.
It took a good 15 minutes for the color to return to my hands.
Just as a reference, in a biology class in college, we did a pain tolerance test. We stuck our hands in a cooler full of iced brine, temp was measured at 20 degrees. I held my hands in the water long enough that I passed the time limit for safety. I didn't like it, but it wasn't intolerable. The stream? It was intolerable. It felt like my nails were being pulled out by the roots with pliers.