Scattering and Absorption

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Presentation transcript:

Scattering and Absorption How does the color of the aerosol affect the light energy hitting it? Photo: L. Harkness

Notes Scattering: light energy hits and bounces off a substance in different directions, causes cooling Absorption: light energy taken in by substance, causes warming http://ww2010.atmos.uiuc.edu/guides/mtr/opt/mch/gifs/sct1.gif

Notes Albedo: the ability of a substance to reflect back light energy (snow – high albedo; blacktop – low albedo)

Notes Light Energy: energy coming from the sun; also known as electromagnetic energy http://chemwiki.ucdavis.edu/@api/deki/files/9199/675px-EM_Spectrum_Properties_edit.svg.png?size=bestfit&width=675&height=400&revision=1

Video Notes Describe what you see in the bottle with only compressed air. How are the results different after aerosol particles (smoke from the matches) were added?

Video: Bill Nye Cloud in a Bottle Experiment Click here for the video!!

Experiment It’s a hot summer day. Which color shirt do you decide to wear, white or black? Why??

Experiment Each group with be testing both pure snow and snow with soot. Make sure you take detailed observations, including color, temperature, changes you see Record your data on your lab handout Be prepared to explain changes you see taking place

Alternate Experiment Each group with design an experiment using the materials provided. Once you have written you lab procedures, get them approved before moving on. When you start your experiment, make sure you take detailed observations, including color, temperature, changes you see Record your data on your lab handout You will be completing a full lab report upon completion

Lab Report At the conclusion of the experiment, you will write a full lab report with the following sections: Introduction (include the problem or question and your hypothesis) Materials (what did you use) Procedure (how did you conduct your experiment) Observations (what did you see taking place) Data Tables and Graphs Analysis/Discussion (interpret evidence) Accept or Reject Hypothesis