Monday 2/9/2015

Agenda: Heat Transfer

Notes: Heat Transfer (Conduction, Convection and Radiation)

Activity: Heat Transfer Worksheet

Homework/ClassworkHeat Transfer Worksheet due Tuesday 2/10/2015 for 25 Points

Energy Heat TransferMost of the energy that reaches Earth comes from the sun (solar

energy)What happens to the solar energy when it reaches Earth?

◦ First reaches Earth’s atmosphere Some gets absorbed by gases, such as ozone (O3) & water vapor (H2O) -

greenhouse gases

◦ Some gets reflected back to space by clouds & Earth’s surface

◦ Some gets absorbed by land masses or oceans

Energy Heat Transfer Processes

• Solar/heat energy gets transferred between Earth’s surface & atmosphere by

• Conduction

• Convection

• Radiation

Energy Heat Transfer Processes

Conduction – process by which heat energy is transmitted through direct contact with neighboring molecules◦Air & water are poor conductors of heat energy

◦Most conduction occurs at Earth’s surface

Energy Heat Transfer Processes

• Convection – process by which heat energy is transmitted by transporting groups of molecules

from one place to another• Can occur in fluids, such as air & water

Energy Heat Transfer Processes• Convection –

• Heated molecules move faster & more spread apart compared to less heated (cooler) molecules

• Warmer air masses are therefore less dense (less molecules in a space)

• Therefore, warmer air masses rise

• Cooler air masses are more dense (more molecules in a space), so they fall back toward the Earth’s surface

Energy Heat Transfer Processes

• Radiation – process by which heat energy is transferred by electromagnetic waves

• EM Spectrum

Tuesday 2/10/2015

Agenda: Heat Transfer

Review of Heat Transfer

Activity: Heat Transfer Foldable (Notebook Check)

Homework/ClassworkHeat Transfer Foldable due Wednesday/Thursday 2/11-2/12/2015 for 30 Points

Heat Transfer Foldable Activity• You will be making a foldable modeling the three type s of heat

transfer: convection, conduction and radiation

• The pictures on the front of the foldable have to be associated with the type of heat transfer

• Your foldable needs to include “real world examples” for each type of transfer

• Foldable needs to be organized, neat and colored for credit!!

• This will count as an assignment in your next NOTEBOOK CHECK!

Wednesday/Thursday 2/11-2/12/2015

Agenda: Heat Transfer

Notes: The Atmosphere

Activity: Layers of the Atmosphere Packet and Graphing Activity

Homework/ClassworkLayers of the Atmosphere Reading and Chart due Friday for 25 Points

What is the Atmosphere?Atmosphere – Very

thin envelope of gases that surrounds Earth

◦Used by living organisms for chemical compounds/nutrients (I.e., O2, CO2, H2O, N2)

◦Has no outer

boundary, just fades into space

Past & Present Composition of Earth’s AtmosphereThe composition of the Earth’s atmosphere has changed since the formation of the Earth.

Earth has had approximately 3 different atmospheres over the course of 4 billion years.

Earth’s First Atmosphere

The Earth’s first atmosphere was mainly helium (He) & hydrogen (H).

Past & Present Composition of Earth’s AtmosphereEarth’s Second AtmosphereVolcanic emissions later added carbon dioxide,

nitrogen, water, sulfur dioxide & other elements.

No free O2 at this time

Large amounts of carbon dioxide (CO2) from

volcanoes caused the Earth’s past climate to be warmer than today’s.

Without carbon dioxide, no life could be present on Earth.

Ocean formation occurs due to presence of H2O in atmosphere

Past & Present Composition of Earth’s Atmosphere

Today’s Atmosphere◦Nitrogen (N2)- 78%

◦Oxygen (O2)- 21%

◦Carbon Dioxide (CO2) - 0.03%

◦Other miscellaneous gases (I.e., H2O).

Friday 2/13/2015

Agenda: The Atmosphere

Review: Conduction, convection and radiation

Activity: Heat Transfer Reading and Questions

Homework/ClassworkHeat Transfer Reading and Questions due today in

class for 20 Points