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.
Room temperature may be 20 degrees Celsius that is equal to 68 degrees Fahrenheit.   There is no fixed room temperature. I feel a bit chilly at 68 F (20 C) in the winter ti â¦ me and warm at 75 F (22 C) in the summer.Most people are comfortable at temperatures in this range.o convert from Celsius to Farenheit, use this equation: F=(1.8 x C) + 32 Fahrenheit = 1.8 times the Celsius temoerature, plus 32 degrees. To convert from Farenheit to Celsi â¦ us, use this equation: C=(F-32) / 1.8 Celsius = Fahrenheit temperature minus 32 degrees, then divide by 1.8.