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this post was submitted on 12 Mar 2024
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Not sure where you got -4F from.
USDA, United States Department of Agriculture, recommends 0°F or -17.8°C
100°F in the shade isn't extreme, and you'd be able to survive normally (With more water, everyone can use more water)
100°F is hot tub water
120°F is recommended hot tap water
140°F water will pretty much burn you instantly
The 120 and 140 don't make that much sense unfortunately.
90-110 is hand washing temp. 100 average.
110 is hot
120 recommend max
130 very hot
140 very very hot
150 burns
If I said to you. Would you stick your hand in 50°C water for 100 dollars would you do it?
What about 60°C?
65°C?
I bet you don't know what would happen if you stuck your hand in 65°C water without looking it up. There's a huge jump from 60° to 65°C. 70°C will instantly scald you.
Someone out there is stupid enough to think. Water boils at 100°C, 65 should be perfectly fine. Even though water doesn't boil until 212°, most people would be cautious of sticking their hand in 100°F+ water.
Yes if you think 40°C+ is hot then you can gather that 65°C would be hotter. But why compare to 40° when you can do 100°.
Why compare it to 40°? Because I know what 40° feels like because I've been living in a civilized country with a civilized measurement system all my life. I can tell you that 65° is too hot, because I make my tea with 70° to 80° hot water. Therefore just before that will probably be too hot for my skin.
In the end, there is no objectively better system when it comes to day to day temperatures. But there is one when it comes to science, reliability and universality and that is Celsius.
All international science uses metric and slowly but surely the resistance amongst US universities melts away and they switch to metric as well. Give it another one or two generations and we'll finally be rid of the outdated and arbitrary imperial system!
USA uses US Customary units, not Imperial units.
Fahrenheit is grouped with US Customary units but is not one.
I agree metric system is superior and there isn't a reason to use Inches, Feet, Yards, etc.
But Fahrenheit is a great system for weather and works great for everything else.
For science if I have to heat a beaker to 280° it doesn't matter if it's C or F. I'm not going to be able to relate to 280° in either system. The instrument is going to have to tell me the exact measurement.
Same with like a tape measure. I can measure out 3 meters. I don't need to know how long 3 meters is to do that.
However, mark two lines on a piece of paper and I will get closer guessing in inches than cm because I know the US customary units better.
Eventually US will change to metric. But I doubt we will ever not use Fahrenheit for normal day things like weather