Hacker News Reader

Comment by qiqitori | Hacker News Reader

Hrm, everyone is different but I wouldn't consider living in a place like that.

PSA: 100 F is 37.7778C. Here is a relatively simple way to convert Fahrenheit to Celsius in your head. You just need to remember three simple facts:

1. 32 F is exactly 0 C. 32 F is a nice round number that most people here probably come across a lot.

2. 50 F is exactly 10 C. Again, a nice and round number.

3. It's a linear relationship.

So every 18 F the temperature goes up by 10 C.

View on HN

The equation is "F = C * 9 / 5 + 32", and reversed, "C = (F - 32) * 5 / 9"

If you're just quickly doing it in your head, "F = C * 2 + 30" and "C = (F - 30) / 2" are pretty close.

Yes, but even better would be:

fahrenheit to celcius: ((F-32)/2)+10%

So: 100F = 100-32=68/2=34+3.4=37.4 (actual 37.7) 32F = 0/2=0 50F = 50-32=18/2=9+10%=9.9 (actual 10)

I prefer this heuristic, since after taking the 32 difference, it’s just halving and adding 10%, which is very easily and quickly done mentally (as compared to (5/9)

82 F = 28 C is where I usually start

Also handy if you live up north, -40C == -40F

0C is cold

10C is cool

20C is nice

30C is warm

40C is hot

-30°C is too cold

-20°C is uncomfortably cold

-10°C is cold

Around 0°C, temperature is not the issue. Water, snow, and ice are.

+5°C is cool

+10°C is nice and cool

+15°C is nice

+20°C is nice and warm

+25°C is warm

+30°C is hot

+35°C is uncomfortably hot

+40°C is too hot

I take it you're from somewhere a bit north :)

-40C is when the snow squeaks like styrofoam and the line feeding my fridge water freezes

-40 degrees is where you don't need to specify C or F because they're the same.

This is my range

Here in Brisbane we get wicked humidity, which means that even 27C can be disgusting. As a child I lived in the Wimmera, which is quite dry, and 35C was nice.

Personally, I think 74F degrees is to hot, 72F is normal, 70F is too cool. What's all that in C?

Americans are helping the rest of world get used to 70 degrees being nice weather

0c = very very cold

10c = very cold

15c = cold

20c = cool

25c = nice

30c = i want air blown at me

35c = need more air (roughly the same for 37)

40c = its hot, need cool air

45c+ = very hot, do something

I feel like most people (or most people I've known, in the US East) would probably compress that:

10C cold

15C cool

20C nice

25C warm

30C hot

i've heard

0C is cold

10C is not

20C is warm

30C is hot

which rhymes

Another rhyme

30 is hot

20 is nice

10 is cold

0 is ice

non native speaker here: how does h"ot" and c"old" rhyme? it's a different 'o' sound and d/t is not exactly similar also.

To add to the other replies, here's the English page for rhyming schemes, which calls this pattern "XAXA".

https://en.m.wikipedia.org/wiki/Rhyme_scheme

A more notable version of the same idea, which includes more unrhymed lines, is double dactyl (XXXA XXXA). Though this is more for poetry/limerick, and not for mnemonics.

No worries, you're correct, those lines don't rhyme.

It's pretty common for English poetry and songs to only rhyme every other line

they don't. in both cases, only every other line is rhyming. hot and not, ice and nice.

Depends how much time you spend outside.

Some people live in places that are sub-freezing for 100 days in a row.

Reply on news.ycombinator.com