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.
Celsius is a temperature scale where the freezing point of water is 0 degrees and the boiling point is 100 degrees. Used to known as centigrade until the mid of 20th century. The abbreviation is oC. Fahrenheit is a temperature scale where the freezing point of water is 32 fahrenheit degrees and the boiling point is 212 degrees. It is replaced by celsius scale as part of the metrication process but it is used in United States for all kinds of applications to measure the temperature. The abbreviation is oF.