You may need to "calibrate your finger" for different number of dips, I suggest you try this around 160F first. If you're afraid to try this, test it at a lower temp. Obviously if the water is already bubbling and near boiling (over 200) then you can see that visually and you don't want to use this method. The way way my chem teacher demonstrated it to me, he said you dip the finger until you get a pain and you don't want to dip it in again. The goal is to get an "ouch" reaction, not an actual burn. Then you dip it back in again, each dip/pull out should take about half a second. It helps calculate the exact sunrise, sunset, Magic hour, and Blue Hour times, and even shadows. You pull it out and it has a slight coating of the hot water, which transfers the heat to the fingertip. It is just before the sun hides and a little afterward. This is sort of like the "Liedenfrost effect," you can dip your finger briefly into water hot enough to burn you, if you just pull it out quickly enough, and it won't actually burn you. You're just supposed to dip it into the water for the briefest time possible, just long enough to wet it. The goal is not to dip your finger into boiling water and have it come out with actual burns. Some people are more sensitive to heat and won't be able to do this, but most people can do it.Įdit: I suppose I should clarify. I was taught this by my chemistry teacher, it turned out to be surprisingly accurate, to within about 5 degrees. West Sacramento, United States - Position of the sun in the sky on August 31. On the other end, if it's already bubbling, it's over 200 degrees and don't stick your finger in it at all. Generic astronomy calculator to calculate times for sunrise, sunset. If you can dip your finger 3 times before the ouch, it's 180. If you can dip your finger in once quickly, pull it out, and redip it before you go "ouch" it's ten degrees less, 190. If you can barely dip your finger in once and it burns instantly, it's 200 degrees.
ESTIMATE TIME UNTIL SUNSET BY SUN HOW TO
OK, here's a really good one, how to measure temperature of a hot liquid from about 160 up to 200 degrees.
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