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# 9th Grade Chapter 1 Lesson 4

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### 9th Grade Chapter 1 Lesson 4

1. 1. 9 th Grade Chapter 1 Lesson 4 Pgs. 10-15 For Student Use Only
2. 2. SI Units <ul><li>Technology has made tools and measurements more precise and accurate. </li></ul><ul><li>The Metric System was more precisely defined and it became the “Systeme International d/Unites” or International System of Units </li></ul>
3. 3. SI Units <ul><li>LENGTH </li></ul><ul><ul><li>The meter (m) is the standard for length in the SI System </li></ul></ul><ul><ul><ul><li>It is how far light travels in a fraction of a second </li></ul></ul></ul><ul><ul><ul><li>It is 39.37 inches </li></ul></ul></ul><ul><ul><ul><ul><li>Centimeter (cm)- is 1/100 of a meter or the width of a sugar cube </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Millimeter (mm)- is 1/1000 of a meter or the width of a paper clip </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Kilometer (km)- is 1000 meters or about 6/10 of a mile </li></ul></ul></ul></ul>
4. 4. SI Units <ul><li>Volume </li></ul><ul><ul><li>The liter (L) is the standard unit of volume (or capacity) in the SI system </li></ul></ul><ul><ul><ul><li>It is the amount of dry or liquid matter that a cube 10 cm x 10 cm will hold (about a 4in x 4in cube) </li></ul></ul></ul><ul><ul><ul><ul><li>Milliliters (mL)- 1/1000 of a liter or the volume of a sugar cube </li></ul></ul></ul></ul>
5. 5. SI Units <ul><li>MASS </li></ul><ul><ul><li>Although mass and weight are connected they are NOT the same. </li></ul></ul><ul><ul><ul><li>Mass is the measure of the amount of matter an object contains. </li></ul></ul></ul><ul><ul><ul><li>Weight is the pull of gravity on an object </li></ul></ul></ul>
6. 6. SI Units <ul><li>The gram is the standard unit of measurement for mass in the SI system </li></ul><ul><ul><li>Based on 1mL of water at maximum density </li></ul></ul><ul><ul><ul><li>The kilogram (kg) is more commonly used because the gram is so small </li></ul></ul></ul>
7. 7. SI Units <ul><li>Time </li></ul><ul><ul><li>Time is measured in seconds. </li></ul></ul><ul><ul><ul><li>Seconds are no longer based on the rotation of the earth, but are based on the time it takes a certain type of cesium atom to vibrate 9,192,631,770 times. </li></ul></ul></ul><ul><ul><ul><li>This is how atomic clocks are so accurate. </li></ul></ul></ul><ul><ul><ul><li>Hours and minutes are based on multiples of 60. </li></ul></ul></ul>
8. 8. SI Units <ul><li>Temperature </li></ul><ul><ul><li>Temperature in most nations is measured in Celsius. In US Celsius is only used for scientific, technical, or military purpoes. </li></ul></ul><ul><ul><li>Celsius Scale is divided into degrees with 0 ° being freezing and 100° being boiling </li></ul></ul><ul><ul><li>Conversions: </li></ul></ul><ul><ul><ul><li>°F to °C= °C= 5/9(°F-32) </li></ul></ul></ul><ul><ul><ul><li>°C to °F= °F= 9/5(°C)+32 </li></ul></ul></ul>
9. 9. SI Units <ul><li>Temperature </li></ul><ul><ul><li>Kelvin Scale: This is used particularly for Science. (Named after Lord Kelvin) </li></ul></ul><ul><ul><ul><li>Kelvin Scale starts at Absolute Zero (0K) </li></ul></ul></ul><ul><ul><ul><ul><li>Absolute Zero- when molecules cease to vibrate </li></ul></ul></ul></ul><ul><ul><ul><li>Kelvin Scale is based upon the Celsius Scale </li></ul></ul></ul><ul><ul><ul><li>Water freezes at 273.15K </li></ul></ul></ul><ul><ul><ul><li>Water boils at 373.15K </li></ul></ul></ul><ul><ul><li>This temperature is called Absolute Temperature </li></ul></ul>
10. 10. SI Units <ul><li>Kelvin and Celsius Conversions </li></ul><ul><ul><li>Celsius to Kelvin: K= °C + 273.15 </li></ul></ul><ul><ul><li>Kelvin to Celsius: °C=K - 273.15 </li></ul></ul>