When it comes to expressing temperatures in English, it’s important to know how to correctly pronounce the numerical value along with the unit of measurement. In this case, we are focusing on “45 degrees Celsius.”

The pronunciation is straightforward: you say each digit individually and then add the word "degrees" followed by "Celsius." So, for "45 degrees Celsius," you would say "forty-five degrees Celsius."

It’s worth noting that in informal settings, people might abbreviate "degrees" to just "D," so you could also hear someone say "forty-five D Celsius." However, this abbreviation is less common in formal contexts.

Understanding how to pronounce temperature measurements accurately can be particularly useful when traveling, communicating in professional environments, or discussing weather conditions with international colleagues. Remember, clarity is key, especially when dealing with precise information like temperature readings.

So, the next time you need to communicate that the temperature is 45 degrees Celsius, confidently say "forty-five degrees Celsius" and you’ll be understood everywhere!