this post was submitted on 22 Aug 2023
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Water freezes at 0°C at standard pressure, sea level.
If you are above or below, it will be different.
Saying "It's not 0°C outside so there's no ice on the road" is dumb. Because there could definitely be ice on the road.
You should be looking out for other things while driving. Not if the one thermometer, who knows where, is saying that it's 0°C or not.
As usual, there should be a bit of flexibility in there. I am not saying "oh, it's 0C, therefore ALL water in all town is frozen , lets wait until it gets to 1C so all water melt". But more on the line "oh, its around 0C (+ or - 5C), lets be careful while driving because some of the streets might have ice". Farenheit freezing temp is 32 I think? Thats VERY arbitrary. A lot more than C.
23°F to 41°F is -5°C to 5°C
If it's below 40°F I'd be cautious of Ice. Once again, it doesn't matter that water freezes at exactly 32°F at standard pressure.
It's like boiling water. No one puts a thermometer in water to make sure that it hits 100°C exactly.
150°F water will scald you in a second (65°C)
140°F water will scaled you in 3 seconds (60°C)
120°F water will scaled you in 10 minutes (50°C)
+100°F water has the potential to scaled you (~40°C)
I'd rather know that +100°F water has a chance to burn me than remembering +40°C has a chance.
That's way more important knowledge than the freezing and boiling temperatures of water at standard pressure.