temperature. temperature scales temperature can be measured with a variety of scales: – celsius...
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Temperature
Temperature Scales
• Temperature can be measured with a variety of scales:– Celsius scale– Fahrenheit scale– Kelvin scale
Comparison of Temperature ScalesCelsius Scale Fahrenheit Scale Kelvin Scale
Boiling point of water
100C 212F 373 K
Freezing point of water
0C 32F 273 K
Absolute Zero -273C -460F 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.
Absolute Zero
• In Kelvin, it is equal to 0 K.• In Celsius, it is equal to -273C• 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.
Temperature Conversion Formulas
• Celsius can be converted to Fahrenheit• The formula is:
F = 1.8 (C) + 32
• Convert 37 C into F
F = 1.8 (C) + 32
• Convert 37 C into F
F = 1.8 (37C) + 32F = 66.6 + 32
F = 98.6
Significant figures! How many do we keep? 2!97 F
Temperature Conversion Formulas
• Fahrenheit can be converted to Celsius• The formula is:
C = F - 32 1.8
• Convert 75.3 F into C
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!24.1C
• Celsius can be converted to Kelvin• The formula is:
C + 273 = K
• Convert 85.15C into K• Convert 255 K into C
Temperature Conversion Formulas
C + 273 = K
• Convert 85.15C into K
C + 273 = K85.15 + 273 = K
358 K
Significant figures! How many do we keep? 2 decimal places!
358.15C
C + 273 = K
• Convert 255 K into C
C + 273 = KC + 273 = 255
-273 -273C = -18
Significant figures! How many do we keep? 0 decimal places!
-18C
Temperature Conversion Formulas
• To convert from Fahrenheit to Kelvin you must convert Fahrenheit to Celsius AND then convert Celsius to Kelvin!
• Convert 64.9F into K
C = F - 32 and C + 273 = K 1.8
• Convert 64.9F 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
C = F - 32 and C + 273 = K 1.8• Second, convert C into K• C = 18.277
C + 273 = K18.277 + 273 = K
291.277 K
Significant figures! How many do we keep? 3!291 K
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