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Review of Temperature Conversion

Review of Temperature Conversion. Dr. C. Yau Spring 2015 (from Chap.1 Sec 4 Jespersen 7 th edition). Temperature Units. You should already be familiar with the following temperature units: Fahrenheit Celsius kelvin. Interconversion of units cannot be done with dimensional analysis.

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Review of Temperature Conversion

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  1. Review of Temperature Conversion Dr. C. Yau Spring 2015 (from Chap.1 Sec 4 Jespersen 7th edition)

  2. Temperature Units You should already be familiar with the following temperature units: • Fahrenheit • Celsius • kelvin Interconversion of units cannot be done with dimensional analysis.

  3. oF to oC You are expected to know this equation: F = 1.8 C + 32 Where F = temp in oF C = temp in oC And the numbers 1.8, 32 are exact numbers (not limited to 2 sig. fig.)

  4. How to Handle Sig. Fig. What is 28.3 oC in oF? F = 1.8 C + 32 = 1.8(28.3) + 32 = 50.94 + 32 = 82.9 Ans. F = 82.9oF Remember 1.8 and 32 are exact numbers. 3 sig. fig. in multiplication 1 decimal place in addition

  5. oC to oF What is 98.6oF in oC? (normal body temp) F = 1.8 C + 32 Solve for the unknown first (C). Addition: Ans has 1 decimal place. Division: Ans has 3 sig. fig. Ans. 37.0 oC Note the difference between C and oC.

  6. C vs. oC C is simply a letter assigned to be the temperature in units of degrees Celsius. C is not a unit. In this conversion, C is the number AND the unit oC. oC is a unit. So we write C = 37.0oC and not oC = 37.0oC

  7. oC to K (kelvin) We will not be dealing much with the temp unit K until the end of the semester, in the chapter on gases. However, you should know how to handle sig.fig. in the conversion. KNOW this: K = C + 273.15 (5 sig. fig., 2 dec.places) What is 25.4oC in K? K = 25.4 + 273.15 = 298.55 = 298.6 Ans. 298.6 K Note: K not oK

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