Product timeline. 1  1982 â Diet Coke is introduced, becoming the largest-selling low-calorie soft drink in America. 2  1983 â Diet Coke is introduced in the UK. 3  1986 â Diet Cherry Coke is introduced in American markets. 4  1994 â Diet Coke changes logo. 5  1999 â Diet Cherry Coke changes logo. 6  2001 â Diet Coke with Lemon is introduced.
21Â°C = 69.8Â°F. Use the formula F = 9/5C + 32. To convert from Celsius to Fahrenheit, multiply the number by 9, divide by 5, and add 32. In this instance, 21 x 9 = 189 / 5 = 37.8 + 32 = 69.8. Therefore, 21 degrees Celsius is equal to 69.8 degrees Fahrenheit.se the formula F = 9/5C + 32. To convert from Celsius to Fahrenheit, multiply the number by 9, divide by 5, and add 32.
Note that, due to the different scales in Celsius and Fahrenheit, just as zero degrees C and zero degrees F are not equal, neither is twice as cold. Lets make this a little easier to understand. Lets use the Celsius Scale Note: C = Celsius F= Fahrenheit Twice as cold C 0Â°C = 32Â° F 32Â°F X -2 = -64Â°F - 64Â°F = -53.33Â°C Twice as cold F