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Weather

Weather. Where are my notes?. Notes can be found on the website now @ http://isis8science.wikispaces.com We can use these notes, or write down the notes (the classes choice!!). The Air Around You. The air around us consists of many different types of gases in different amounts.

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Weather

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  1. Weather

  2. Where are my notes? • Notes can be found on the website now @ http://isis8science.wikispaces.com • We can use these notes, or write down the notes (the classes choice!!)

  3. The Air Around You • The air around us consists of many different types of gases in different amounts. • The five most abundant gases are Nitrogen (78%), Oxygen (21%), Argon (0.93%) and Carbon Dioxide (0.038%). • Earth’s Atmosphere is also made up of water vapor, along with particles of liquid and solids.

  4. Air Pressure • The force pushing on an area of surface is know as pressure. As such, the weight of the atmosphere exerts a force on surfaces. • Air pressure can be measured through barometers (mercury and aneroid). • It should also be noted that the higher you are from the earth, the lower the air pressure

  5. Energy From The Sun • Most of the earth’s energy comes from the sun in the form of electromagnetic waves. • They are classified according to their wavelength, or distance between waves. • Most of the energy from the sun travels to Earth in the form of visible light and infrared radiation. Infra-Red Radiation

  6. A small amount of energy arrives as ultraviolet radiation. Ultraviolet Image from Sun!

  7. Humidity • Humidity measures the amount of water vapor in the air. • Relative Humidity is the percentage of water vapor compared to dry air particles. • A psychrometer measures relative humidity.

  8. Relative Humidity • If the temperature is hotter, then the amount of wet air particles (water) can be higher. This means a higher relative humidity (相對濕度/ 상대 습도). • With a lower temperature, then the amount of wet air particles can be lower. This means a lower relative humidity.

  9. Wind 風 • Wind is caused by the air masses of different pressures moving to equal their pressures • Different air pressure is caused by air masses of different temperatures • Different temperatures are caused by heat transferring by radiation, convection, and conduction

  10. Sea breeze 海風local wind from an ocean or lake • A sea breeze normally occurs at daytime. Cool air travels to an area of warm air.

  11. Land breeze 陸風local wind from land to water • Land breezes normally occur at night time as cool air travels to an area of warm air.

  12. Temperature Differences • On earth, there are big temperature differences. Most difference are dependant on the amount of sunlight, along with the strength on sunlight. • Everywhere on earth gets the same amount of sunlight each year. • The equator receives the strongest rays from the sun. The poles receive the weakest rays from the sun.

  13. Rain & Mountains • On earth, there are two things which can help create rain. • One is rainforests, the other is mountain ranges. • Due to a change in elevation, warm moist air normally meets cool dry air. This causes rain.

  14. Questions?? • Does anyone have any questions about what we have learnt today? • If you do – now is the time to ask.

  15. Rest of Lesson • For the rest of the lesson, you can complete your test revision. • You can also ask questions.

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