41–50 of 57 posts
I memorize some 10s. 0 is 32, 10 is 50, 20 is 68, 30 is 86. Extend beyond what’s memorized by using the ratio 10/18. I don’t have 40 memorized, but it’s easy to figure that it’s 104. Then use the approximation of 1C=2F to fill in the gaps. High today is 34? That’s 94. Thermostat says 72? That’s 22.
Earlier quoted context omitted.
Which cup?
In case you are not from the US, an official freedom unit of volume is a cup which equals 8 fluid ounces (not the same as ounces which are a unit of weight; yeah it really is that dumb). Almost all cooking recipes use teaspoons (5ml), tablespoons (15 ml), or fractions of a cup (1 fluid oz, 29 ml or so), including for measuring things like cheese, herbs, pasta, etc. No American recipe website will ever say “use 200 gr…
The way I convert is to remember that 32°F is 0°C and then count by "nines" for Fahrenheit to get the desired temperature in Celsius. 32°F = 0°C 41°F = 5°C 50°F = 10°C 59°F = 15°C 68°F = 20°C 77°F = 25°C 86°F = 30°C 95°F = 35°C It's also pretty easy to remember that 10°C = 50°F and 35°C = 95°F if you want to go forward or back from there with the same counting method.
For weather purposes the approximation seems accurate enough. Here’s a table listing the differences: http://tomgermeau.com/tools/FC/
C = 5/9 * (F - 32)
So GP's table is exact.
F = 2*(C-floor(C/10)) + 31
F = 2*C - round(2*C/10) + 32
F = round(9*C/5+32)
Earlier quoted context omitted.
Which cup?
In case you are not from the US, an official freedom unit of volume is a cup which equals 8 fluid ounces (not the same as ounces which are a unit of weight; yeah it really is that dumb). Almost all cooking recipes use teaspoons (5ml), tablespoons (15 ml), or fractions of a cup (1 fluid oz, 29 ml or so), including for measuring things like cheese, herbs, pasta, etc. No American recipe website will ever say “use 200 gr…
For setting the a thermostat, it's not that hard to simply switch your brain over and know what's comfortable inherently in either F or C without doing a conversion back and forth. For accurate conversion, if c=(f-32)/1.8 or the converse is really that troublesome, Google can help you out.
Or we can stop using freedom units and join the rest of the world. Take a small step to make this happen right now: set your phone and thermostat to show you the temperature in Celsius. I did this and my kids are growing up with an intuitive understanding of what 20 degrees C feels like.
Earlier quoted context omitted.
For weather purposes the approximation seems accurate enough. Here’s a table listing the differences: http://tomgermeau.com/tools/FC/
This is not an approximation. The conversion formula is: C = 5/9 * (F - 32) So GP's table is exact.