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# 9th Grade Chapter 3 Lesson 5

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### 9th Grade Chapter 3 Lesson 5

1. 1. 9 th Grade Chapter 3 Lesson 5 Pgs. 74-77 For Student Use Only
2. 2. Meteorology <ul><li>Forecast: </li></ul><ul><ul><li>Forecast: predict the weather </li></ul></ul><ul><ul><ul><li>Based on 5 properties of air: </li></ul></ul></ul><ul><ul><ul><ul><li>Temperature </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Pressure </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Humidity </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Wind direction </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Wind Speed </li></ul></ul></ul></ul>
3. 3. Meteorology <ul><li>Temperature: </li></ul><ul><ul><li>Measured with a thermometer </li></ul></ul><ul><ul><ul><li>Liquid Thermometer: Uses the expansion and contraction of liquid </li></ul></ul></ul><ul><ul><ul><li>Maximum-Minimum Thermometer: type of liquid thermometer that records highs and lows for a day </li></ul></ul></ul><ul><ul><ul><li>Bimetallic Strip Thermometer: different metals expand and contract differently causing rod to bend </li></ul></ul></ul><ul><ul><ul><li>Thermograph: records temperatures over a long period of time </li></ul></ul></ul>
4. 4. Meteorology <ul><li>Pressure: </li></ul><ul><ul><li>Amount of air pushing down </li></ul></ul><ul><ul><li>Measured with a barometer </li></ul></ul><ul><ul><li>Falling pressure= bad weather </li></ul></ul><ul><ul><li>Rising pressure= good weather </li></ul></ul><ul><ul><li>Types of barometers: </li></ul></ul><ul><ul><ul><li>Mercury Barometer- mercury is pushed up tube until the air pressure pushing down equals pressure of mercury </li></ul></ul></ul><ul><ul><ul><li>Aneroid Barometer- air-tight metal box that measures </li></ul></ul></ul>
5. 5. Meteorology <ul><li>Pressure: </li></ul><ul><ul><li>How to measure pressure: </li></ul></ul><ul><ul><ul><li>Standard Measures: </li></ul></ul></ul><ul><ul><ul><ul><li>1 millimeter of mercury or called 1 torr </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Meteorologists uses bar- </li></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>1 Bar= standard atmospheric pressure at sea level </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>1 millibar (mbar)- 1 bar is divided into millibars </li></ul></ul></ul></ul></ul>
6. 6. Meteorology <ul><li>Humidity: </li></ul><ul><ul><li>Amount of water vapor in the air </li></ul></ul><ul><ul><li>Relative Humidity (what meteorologists actually use)- percentage value or moisture in the air </li></ul></ul><ul><ul><ul><li>Measured with a hygrometer </li></ul></ul></ul><ul><ul><ul><li>Sling Psychrometer- measures relative humidity </li></ul></ul></ul>
7. 7. Meteorology <ul><li>Wind </li></ul><ul><ul><li>Wind- tells which way weather is blowing </li></ul></ul><ul><ul><ul><li>Wind Direction </li></ul></ul></ul><ul><ul><ul><ul><li>Measured with a wind vane (winds are named for where they come from) </li></ul></ul></ul></ul><ul><ul><ul><li>Wind Speed </li></ul></ul></ul><ul><ul><ul><ul><li>Measured with an instrument called an anemometer </li></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Wind is measured in knots </li></ul></ul></ul></ul></ul>