Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Conversion of temperature

3,540 views

Published on

MEASUREMENT

Published in: Education
  • Be the first to comment

Conversion of temperature

  1. 1. 1 CONVERSION OF MEASUREMENT Copyright © 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings
  2. 2. 2 Temperature Temperature • is a measure of how hot or cold an object is compared to another object. • indicates that heat flows from the object with a higher temperature to the object with a lower temperature. • is measured using a thermometer. Copyright © 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings
  3. 3. 3 Temperature Scales Temperature Scales Copyright © 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings • are Fahrenheit, Celsius, and Kelvin. • have reference points for the boiling and freezing points of water.
  4. 4. 4 A. What is the temperature of freezing water? 1) 0°F 2) 0°C 3) 0 K B. What is the temperature of boiling water? 1) 100°F 2) 32°F 3) 373 K C. How many Celsius units are between the boiling and freezing points of water? 1) 100 2) 180 3) 273 Learning Check
  5. 5. 5 A. What is the temperature of freezing water? 2) 0°C B. What is the temperature of boiling water? 3) 373 K C. How many Celsius units are between the boiling and freezing points of water? 1) 100 Solution
  6. 6. 6 • On the Fahrenheit scale, there are 180°F between the freezing and boiling points and on the Celsius scale, there are 100°C. 180°F = 9°F = 1.8°F 100°C 5°C 1°C • In the formula for the Fahrenheit temperature, adding 32 adjusts the zero point of water from 0°C to 32°F. TF = 9/5 TC + 32° or TF = 1.8 TC + 32° Fahrenheit Formula
  7. 7. 7 • TC is obtained by rearranging the equation for TF. TF = 1.8TC + 32 • Subtract 32 from both sides. TF - 32 = 1.8TC ( +32 - 32) TF - 32 = 1.8TC • Divide by 1.8 = °F - 32 = 1.8 TC 1.8 1.8 TF - 32 = TC 1.8 Celsius Formula
  8. 8. 8 Solving A Temperature Problem A person with hypothermia has a body temperature of 34.8°C. What is that temperature in °F? TF = 1.8 TC + 32° TF = 1.8 (34.8°C) + 32° exact tenth's exact = 62.6 + 32° = 94.6°F tenth’s Copyright © 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings
  9. 9. 9 The normal temperature of a chickadee is 105.8°F. What is that temperature on the Celsius scale? 1) 73.8°C 2) 58.8°C 3) 41.0°C Learning Check
  10. 10. 10 3) 41.0 °C TC = (TF - 32°) 1.8 = (105.8 - 32°) 1.8 = 73.8°F = 41.0°C 1.8° Solution
  11. 11. 11 A pepperoni pizza is baked at 455°F. What temperature is needed on the Celsius scale? 1) 423°C 2) 235°C 3) 221°C Learning Check
  12. 12. 12 A pepperoni pizza is baked at 455°F. What temperature is needed on the Celsius scale? 2) 235°C TF - 32° = TC 1.8 (455 - 32°) = 235°C 1.8 Solution
  13. 13. 13 On a cold winter day, the temperature is –15°C. What is that temperature in °F? 1) 19°F 2) 59°F 3) 5°F Learning Check
  14. 14. 14 3) 5°F TF = 1.8 TC + 32° TF = 1.8(–15°C) + 32° = – 27 + 32° = 5°F Note: Be sure to use the change sign key on your calculator to enter the minus – sign. 1.8 x 15 +/ – = –27 Solution
  15. 15. 15 The Kelvin temperature scale • has 100 units between the freezing and boiling points of water. 100 K = 100°C or 1 K = 1°C • is obtained by adding 273 to the Celsius temperature. TK = TC + 273 • contains the lowest possible temperature, absolute zero (0 K). 0 K = –273°C Kelvin Temperature Scale
  16. 16. 16 Temperatures TABLE 2.5
  17. 17. 17 What is normal body temperature of 37°C in Kelvins? 1) 236 K 2) 310. K 3) 342 K Learning Check
  18. 18. 18 What is normal body temperature of 37°C in kelvins? 2) 310. K TK = TC + 273 = 37°C + 273 = 310. K Solution

×