Chapter 2 weather factors
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Chapter 2 – Weather Factors. 2/23/10. Section 1- Energy from the Sun. Electromagnetic waves – a form of energy that can travel through space. Radiation – the transfer of energy from an electromagnetic wave. Energy from the Sun.

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Chapter 2 – Weather Factors

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Chapter 2 weather factors

Chapter 2 – Weather Factors

2/23/10


Section 1 energy from the sun

Section 1- Energy from the Sun

  • Electromagnetic waves – a form of energy that can travel through space.

  • Radiation – the transfer of energy from an electromagnetic wave.


Energy from the sun

Energy from the Sun

  • Infrared radiation – form of energy with wavelengths that are longer than red light.

  • Ultraviolet radiation – form of energy with wavelengths that are shorter than violet light.


Energy in the atmosphere

Energy in the Atmosphere

  • Scattering – reflection of light in all directions.

  • Clouds in the atmosphere reflect energy from the sun like mirrors. Dust particles and molecules of gas also reflect the sun in all directions.


Energy on earth

Energy on Earth

  • When Earth’s surface is heated, it radiates some of the energy back into the atmosphere as infrared radiation.

  • This heat is absorbed by water vapor, carbon dioxide, methane, and other gases.


Energy on earth1

Energy on Earth

  • Greenhouse effect – the absorption by which gases hold on to the heat in the air.


Energy on earth2

Energy on Earth


Section 2 heat transfer

Section 2 – Heat Transfer

  • Thermal Energy – the total energy of motion in the molecules of a substance.

  • Temperature is the average amount.


Heat transfer

Heat Transfer

  • Heat – the transfer of energy from a hotter object to a cooler one.

  • There are three types of heat transfer:

    • Radiation

    • Conduction

    • Convection


Radiation

Radiation

  • This is the heat you feel from the sun or a campfire without touching it.

  • You cannot see radiation but you can feel it.


Conduction

Conduction

  • Conduction is the direct energy transfer from one object to another by touching.

    • Ex.

      • When you touch a hot pot that is on the stove.


Convection

Convection

  • Convection is the transfer of energy by the movement of a fluid.

    • Ex.

      • Cooking noodles for spaghetti.


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