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  Kelvin to Celcius

In this mini-project we are going to create a mini application in the console that converts the temperature from kelvin to fahrenheit. If you don't understand the difference between fahrenheit and kelvin that is ok. I'll share with you the formula as we walk through the steps.

I will list out the 6 steps below that you need to take to build out this mini-application. In the following video I will walk through all 6 steps myself so you can see a possible solution.

You can build out this application in any coding environment of your choice. If you are brand new to coding you may want to skip to the next video and watch the first couple minutes to see the coding environment I set up and would suggest you use.

Because this is our first mini-challenge you also may just want to watch me solve this challenge from start to finish to see how we solve these mini challenges then try the next mini challenge on your own.

Challenge: Convert any given temperature in Kelvin to Fahrenheit

1. Let's imagine that the weather reports says that the temperature today will be 301 Kelvin. How should you dress for the day? Let's create an app that lets us know the temperature in fahrenheit. To start, create a variable named kelvinTemp, and set it equal to 301. Write a comment above that explains this line of code.

2. Finding the temperature in Celsius is similar to Kelvin — the only difference is that Celsius is 273.15 degrees less than Kelvin.

Let's convert Kelvin to Celsius by subtracting 273.15 from the kelvinTemp variable. Store the result in another variable, named celsiusTemp.

Write a comment above that explains this line of code.

3. Use this equation to calculate Fahrenheit, then store the answer in a variable named fahrenheitTemp.

Fahrenheit = Celsius * (9/5) + 32

In the next step we will round the number saved to fahrenheitTemp. Write a comment above that explains this line of code.

4. Log to the console the value of fahrenheitTemp. In our next step we are going to see what we can do to make sure that our number is a whole number by rounding down. The value you logged to the console should begin with 82.13

5. As we have just seen, when you convert from Celsius to Fahrenheit, you often get a decimal number. Go ahead and delete the console log code from step 4.

Use the .floor() method from the Math library to round down the Fahrenheit temperature. Save the result to the fahrenheitTemp variable. Check out the documentation for Math.floor() here: http://bit.ly/javascript-math-floor. Because this is a new concept we haven't covered yet, you may want to watch the next video if you get stuck at this point. This will round your decimal down no matter what the value. Other methods from the Math library you might try out are .round() and ceil(). Write a comment above that explains this line of code.

6. Use console.log and string concatenation to log the temperature in fahrenheitTemp to the console to create the message as follows: The temperature is TEMPERATURE degrees Fahrenheit. TEMPERATURE should be determined by the value of fahrenheitTemp.

Great job! I'll walk through these steps in the next video!

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