The Fahrenheit scale is a temperature scale based on one proposed in 1724 by Amsterdam-based physicist Daniel Gabriel Fahrenheit (1686–1736), after whom the scale is named. It uses the degree Fahrenheit (symbol: °F) as the unit. Several accounts of how he originally defined his scale exist. The lower defining point, 0 °F, was established as the temperature of a solution of brine made from equal parts of ice and salt. Further limits were established as the melting point of ice (32 °F) and his best estimate of the average human body temperature (96 °F, about 2.6 °F less than the modern value due to a later redefinition of the scale). The scale is now usually defined by two fixed points: the temperature at which water freezes into ice is defined as 32 °F, and the boiling point of water is defined to be 212 °F, a 180 °F separation, as defined at sea level and standard atmospheric pressure. By the end of the 20th century, Fahrenheit was used as the official temperature scale only in the United States (including its unincorporated territories), its freely associated states in the Western Pacific (Palau, the Federated States of Micronesia and the Marshall Islands), the Bahamas, Belize, and the Cayman Islands. All other countries in the world now use the Celsius scale, defined since 1954 by absolute zero being −273.15 °C and the triple point of water being at 0.01 °C. Celsius (°C)

The Celsius scale is nowadays set in such a way that Zero degrees C is the temperature at which ice melts (note : not the temperature at which it freezes, which is different!) . At the other end of the scale, 100 degrees Celsius is the boiling point of water. P-40N, 5,219 built March 1943 to November 1944, deliveries 546 Australia (serials A29-812 to 818 were renumbered 698 to 704, as they were N-20, the change meant 600 to 704 were N-20, 800 to 828 were N-25 (less 812 to 818)). 456 Britain (Kittyhawk IV, FT849 to 954, FX498 to 847, 19 lost at sea), 130 Britain for Russia (FS270 to 399), 35 Canada, 321 China, 77 Netherlands East Indies, 175 New Zealand, 850 Russia, 2,588 USAAF.Similarly, to go from zero centimeters to 1 centimeter, we need only add 1 centimeter. The only difference between adding one inch or one centimetre is the amount of distance we're adding. The relationship between an inch and a centimetre is that 1 inch is 2.54 centimetres. So we can say that adding 1 inch is the same as adding 2.54 centimetres. Because they both start at zero, the formula to convert between the two very easy (in = cm * 0.39370) P-40K-1, 600 built May to September 1942, deliveries, 336 USAAF, 191 Britain (Kittyhawk III, FL710 to 713, FL875 to 882, FL884 to 905, FR111 to 115, FR210 to 361), 73 Russia.

The production total of 13,739 is correct but the USAAF counts the XP-40, has 199 P-40 and 1 P-40G, has 22 P-40D and 1 XP-40F, also 5,219 P-40N and 1 XP-40Q. The PDF counts the P-40F static test airframe 41-13696. Their big miss here is that the last 500 airframes of the E-1 model had Fin Fillets (ala Short tailed K models), makes it really hard to tell the difference between the K-1/5 and the late E-1's unless you can see the serial number or know what to look for and even then it can stump you (often does). There are other things on the E-1 that help you tell the difference between it and the RAF version but its getting into nitty gritty). Tomahawk I, 140 built June to October 1940, I have not seen any RAF documents stating modified Tomahawk I became Tomahawk II. 12 lost at sea Unified Threat Protection (UTP) (IPS, Advanced Malware Protection, Application Control, Web & Video Filtering, Antispam Service, and 24x7 FortiCare) P-40L-10 Serials 42-10700 to 10848 "Relocated auxiliary fuel pump; sheet metal carburettor air intake elbow; deletion of coolant tank armour, propeller warning light, aileron electrical trim tab, coolant warning light, pilot's tube, data case and wing walkway; relocation of parking harness, droppable sway braces for 75 gallon belly tank."

P-40F, 1,311 built January 1942 to January 1943, deliveries 150 Britain (Kittyhawk IIA FL219 to 368, 21 lost at sea), 1,161 to USAAF.