The ”fels like” is calculated based on the comparison between a dry bulb thermometer (normal thermometer) and a wet bulb thermometer. (A thermometer with a wet wick over the bulb) it also takes into account the wind chill factor which affects how fast something cools off.
Like you’re five, if it is -10° with a “feels like” of -17° the coldest any object will get is -10°. But the speed at which it cools from normal to -10° is the same as if you put it in a -17° freezer
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