1. Temperature

2. Temperature Scales Temperature can be measured with a variety of scales: – Celsius scale – Fahrenheit scale – Kelvin scale

3. Comparison of Temperature Scales Celsius ScaleFahrenheit ScaleKelvin Scale Boiling point of water 100  C212  F 373 K Freezing point of water 0C0C32  F 273 K Absolute Zero -273  C-460  F 0 K The Celsius scale is used in Canada and Europe. The Fahrenheit scale is used in the United States & the UK. The Kelvin scale is used by scientists.

4. Absolute Zero In Kelvin, it is equal to 0 K. In Celsius, it is equal to -273  C Is the lowest possible temperature Experiments have shown that matter cannot be cooled to temperatures lower than absolute zero. At absolute zero there is absolutely no movement of matter.

5. Temperature Conversion Formulas Celsius can be converted to Fahrenheit The formula is:  F = 1.8 (  C) + 32 Convert 37  C into  F

6.  F = 1.8 (  C) + 32 Convert 37  C into  F  F = 1.8 (37  C) + 32  F = 66.6 + 32  F = 98.6 Significant figures! How many do we keep? 2! 97  F

7. Temperature Conversion Formulas Fahrenheit can be converted to Celsius The formula is:  C =  F - 32 1.8 Convert 75.3  F into  C

8.  C =  F - 32 1.8 Convert 75.3  F into  C  C =  F - 32  C = 75.3- 32  C = 43.3 1.8 1.8 1.8  C = 24.055 Significant figures! How many do we keep? 3! 24.1  C

9. Celsius can be converted to Kelvin The formula is:  C + 273 = K Convert 85.15  C into K Convert 255 K into  C Temperature Conversion Formulas

10.  C + 273 = K Convert 85.15  C into K  C + 273 = K 85.15 + 273 = K 358 K Significant figures! How many do we keep? 2 decimal places! 358.15  C

11.  C + 273 = K Convert 255 K into  C  C + 273 = K  C + 273 = 255 -273 -273  C = -18 Significant figures! How many do we keep? 0 decimal places! -18  C

12. Temperature Conversion Formulas To convert from Fahrenheit to Kelvin you must convert Fahrenheit to Celsius AND then convert Celsius to Kelvin! Convert 64.9  F into K

13.  C =  F - 32 and  C + 273 = K 1.8 Convert 64.9  F into K First, convert  F into  C  C =  F - 32  C = 64.9 - 32  C = 32.9 1.8 1.8 1.8  C = 18.277

14.  C =  F - 32 and  C + 273 = K 1.8 Second, convert  C into K  C = 18.277  C + 273 = K 18.277 + 273 = K 291.277 K Significant figures! How many do we keep? 3! 291 K