SCATTERING AND ABSORPTION

How does the color of the aerosol affect the light energy hitting it?

Photo: L. Harkness

• Scattering: light energy hits and bounces off a substance in different directions, causes cooling

• Absorption: light energy taken in by substance, causes warming

NOTES

http://ww2010.atmos.uiuc.edu/guides/mtr/opt/mch/gifs/sct1.gif

• 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

NOTES

http://chemwiki.ucdavis.edu/@api/deki/files/9199/675px-EM_Spectrum_Properties_edit.svg.png?size=bestfit&width=675&height=400&revision=1

• 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 NOTES

Click here for the video!!

VIDEO: BILL NYE CLOUD IN A BOTTLE 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

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

ALTERNATE EXPERIMENT

• 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

LAB REPORT