Centigrade vs Fahrenheit cheat sheet: Difference between revisions
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Fahrenheit = (9/5 C) + 32 | Fahrenheit = (9/5 C) + 32 | ||
::: | ::: Fast, overstating approximation: double C and add 32. | ||
:::: | :::: The doubling is off by 10%. 2 is 10/5; the correct formula is 9/5, so the correct factor is nine/tenths of the fudge factor. | ||
:::: double C, subtract 10% of that product from itself, then add 32 | :::: double C, subtract 10% of that product from itself, then add 32 | ||
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! C | ! C | ||
! F | ! F | ||
! How does it feel? | |||
|- valign="top" | |- valign="top" | ||
|align="right"| 0 | |align="right"| 0 | ||
| 32 | | 32 | ||
| colspan="2"| cold| | |||
|- valign="top" | |- valign="top" | ||
|align="right"| 5 | |align="right"| 5 | ||
| 41 | | 41 | ||
<!-- merged --> | |||
|- valign="top" | |- valign="top" | ||
|align="right"| 10 | |align="right"| 10 | ||
| 50 | | 50 | ||
| | |||
|- valign="top" | |- valign="top" | ||
|align="right"| 15 | |align="right"| 15 | ||
| 59 | | 59 | ||
| | |||
|- valign="top" | |- valign="top" | ||
|align="right"| 20 | |align="right"| 20 | ||
| 68 | | 68 | ||
| | |||
|- valign="top" | |- valign="top" | ||
|align="right"| 25 | |align="right"| 25 | ||
| 77 | | 77 | ||
| | |||
|- valign="top" | |- valign="top" | ||
|align="right"| 30 | |align="right"| 30 | ||
| 86 | | 86 | ||
| | |||
|- valign="top" | |- valign="top" | ||
|align="right"| 35 | |align="right"| 35 | ||
| 95 | | 95 | ||
| | |||
|- valign="top" | |- valign="top" | ||
|align="right"| 40 | |align="right"| 40 | ||
| 104 | | 104 | ||
| | |||
|} | |} | ||
| Line 83: | Line 93: | ||
| 112 | | 112 | ||
|} | |} | ||
; Feelings, whoa-oh-oh-oho, feelings | |||
Revision as of 10:33, 2 December 2020
Celsius = 5/9 (F - 32)
Fahrenheit = (9/5 C) + 32
- Fast, overstating approximation: double C and add 32.
- The doubling is off by 10%. 2 is 10/5; the correct formula is 9/5, so the correct factor is nine/tenths of the fudge factor.
- double C, subtract 10% of that product from itself, then add 32
- Fast, overstating approximation: double C and add 32.
| C | F | How does it feel? | |
|---|---|---|---|
| 0 | 32 | cold| | |
| 5 | 41 | ||
| 10 | 50 | ||
| 15 | 59 | ||
| 20 | 68 | ||
| 25 | 77 | ||
| 30 | 86 | ||
| 35 | 95 | ||
| 40 | 104 | ||
- Double C and add 32 becomes less accurate as the temperatures rise. It is exactly right at 0 C, off by 8 at 40 C, and off by 20 at 100 C.
| C | F | 2*C + 32 |
|---|---|---|
| 0 | 32 | 32 |
| 5 | 41 | 42 |
| 10 | 50 | 52 |
| 15 | 59 | 62 |
| 20 | 68 | 72 |
| 25 | 77 | 82 |
| 30 | 86 | 92 |
| 35 | 95 | 102 |
| 40 | 104 | 112 |
- Feelings, whoa-oh-oh-oho, feelings