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temperature (mander.xyz)

submitted 8 months ago by fossilesque@mander.xyz to c/science_memes@mander.xyz

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[+] Sludgeyy@lemmy.world -13 points 8 months ago

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°.

[-] XM34@feddit.de 8 points 8 months ago

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 Give it another one or two generations and we'll finally be rid of the outdated and arbitrary imperial system!

[-] Sludgeyy@lemmy.world -3 points 8 months ago

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

[-] Allero@lemmy.today 5 points 8 months ago* (last edited 8 months ago)

I can absolutely tell 65°C is too hot, that's 5°C short of what is piped as literal hot water in the taps in my area.

I would not recommend going above 40°C for washing, and there is literally zero issue remembering that. Body temperature of a healthy human is 36,6-36,7°C (97,9-98,1°F), everything above that is hot.

As such, there is literally zero issue figuring 40°C is reasonably hot and 65°C is unreasonably hot, it doesn't take a genius.

Speaking of water, Celsius is obviously superior as a water-based system. I can easily tell temperature in my kettle goes to 100°C (212°F, huh?), or steps down to 90°C (194°F??) or 80°C (176°F??) to brew a perfect cup of tea. When temperature outside goes 0°C (32°F??), I know I can expect ice and snow. And for everything in between, I can make a pretty accurate approximation.

And finally, modern Fahrenheit scale is literally defined through Celsius. It's a scale that is defined as 32°F at the freezing point of water (i.e. 0°C) and 212°F at water boiling point (i.e. 100°C). You're literally using Celsius but make it harder for no reason.