First a few facts: One inch is defined as 2.54 centimeters. Yes, Metric is the world standard and today most American units are defined in terms of the Metric.

A Standard Atmosphere is defined as the pressure equivalent to that exerted by a 760mm column of Mercury at 0°C at sea level at Standard Gravity.

Centigrade was defined as a scale from 0° where water freezes to 100° where it boils, under standard atmospheric pressure. Fahrenheit defined 0 as the temperature resulting from mixing equal weights of snow and salt. I have not been able to find how he defined the temperature of boiling water. Anyway, 32° and 212° corresponds to 0 and 100 Centigrade. Making the number of degrees between the freezing and boiling of water 212-32=180. Hence: One degree Centigrade is equivalent to 1.8 degrees Fahrenheit. So, we get the formula: F=1.8*C + 32 (Note: 1.8 = 9/5)

 0   32.0       50  122.0
 1   33.8       51  123.8
 2   35.6       52  125.6
 3   37.4       53  127.4
 4   39.2       54  129.2

 5   41.0       55  131.0
 6   42.8       56  132.8
 7   44.6       57  134.6
 8   46.4       58  136.4
 9   48.2       59  138.2

10   50.0       60  140.0
11   51.8       61  141.8
12   53.6       62  143.6
13   55.4       63  145.4
14   57.2       64  147.2

15   59.0       65  149.0
16   60.8       66  150.8
17   62.6       67  152.6
18   64.4       68  154.4
19   66.2       69  156.2

20   68.0       70  158.0
21   69.8       71  159.8
22   71.6       72  161.6
23   73.4       73  163.4
24   75.2       74  165.2

25   77.0       75  167.0
26   78.8       76  168.8
27   80.6       77  170.6
28   82.4       78  172.4
29   84.2       79  174.2

30   86.0       80  176.0
31   87.8       81  177.8
32   89.6       82  179.6
33   91.4       83  181.4
34   93.2       84  183.2

35   95.0       85  185.0
36   96.8       86  186.8
37   98.6       87  188.6
38  100.4       88  190.4
39  102.2       89  192.2

40  104.0       90  194.0
41  105.8       91  195.8
42  107.6       92  197.6
43  109.4       93  199.4
44  111.2       94  201.2

45  113.0       95  203.0
46  114.8       96  204.8
47  116.6       97  206.6
48  118.4       98  208.4
49  120.2       99  210.2
                100 212.0

Notes:

1. The above table is exact. There has been no rounding. I created it by successively adding 1.8 to 32 one hundred times.
2. For any of the Fahrenheit temperatures if you add the digits together you will get 5. If you get a number larger than 5 add those digits together and you will get 5. This is true even for temperatures as high as 1000°C which is 1832°F and is about what we call "Red Hot".
3. Human body temperature is defined as 37°C
4. I use the Centigrade scale because: For human comfort, 20°C is a little cool, and 30°:C is starting to get too warm. Roughly: Any temperature in the 20's is nice. Outside that you are uncomfortable, and have to "do something" about the temperature. Lastly, zero is a serious temperature, and at negative temperatures one better start worrying about things freezing.
5. In 1948 a committee decided to rename Centigrade to Celsius after the founder: Anderus Celsius a Swedish astronomer who lived from 1701 to 1744; and gave it the name Centigrade. I use the name Centigrade, because it has meaning.
   • In 1790 the meter was defined as one ten-millionth the distance from the equator to the north pole, passing through Paris. Today, we speak of the centimeter we don't call it an Eratosthene in honor of the discover. A Greek mathematician and astronomer in the third century B.C.; accurately estimated the circumference of the earth.

     The idiots in 1948 should have thought about language consistency!

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