Module 2 Pretest Homework Packet Answers

 

Part G Temperature Conversion 5 points

 

The general formula for the conversion of temperatures on scale X to temperatures on scale Y is:

oY = Y units/ x units ( oX - RPx) + RPy

 

1.Write the formula for the conversion of Fahrenheit to Celsius:

 

oC = 5 C units/ 9 F units [ oC (-40)] + (-40)

or

oC = 5 C units/ 9 F units (oC +40) - 40

 

 

2. Write the formula for the conversion of Kelvin to Celsius:

 

oC = K - 273

 

3. convert -196oC to oF

 

oF = 9 F units/ 5 C units [ oC + 40)] - 40

 

oF = 9/5 (-196 + 40) 40 = 9/5 (-156) 40 = - 280.5 -40 = -320.5 oF

 

 

 

4. convert -196oC to K

 

K = oC + 273

 

K = oC + 273 = -196 + 273 = 77 K

 

 

 

 

5. The Rankin scale uses a Fahrenheit unit, but assumes zero to be absolute zero. If absolute zero on the Kelvin scale is zero and on Celsius scale is -273oC, calculate absolute zero on the Fahrenheit scale, then estimate the Freezing point of water on the Rankin scale.

(The BP water = 212 oF = 100 oC = 373K)

 

 

oF = 9 Funits/ 5 Cunits [ oC + 40)] - 40

 

oF = 9/5 (-273 + 40) 40 = 9/5 (-233) 40 = - 419.4 -40 = -459.4 oF

 

absolute zero on Rankin = 0 R equates to -459.6 oF therefore:

 

oR = 1 Runits/ 1 Funits [ oF (-459.4)] + 0

 

oR = 1 / 1 [ 32oF (-459.4)] + 0 = 32 + 459.4 = 491.4 oF

 

 

 

 

 

 

 

Additional Homework (not required) for your practice:

Corwin 7th edition:

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