MEASURING AEROSOLSUsing a computer program to measure aerosol particles collected on Pico

Before After

Results (Measurements)

• Soot looks like tiny round particles stuck together

• When first emitted, soot particles are small and elongated

• As they travel, they become more round and compact

• At Pico – very compacted = more aged (travelled long distances)

WHAT HAPPENS TO SOOT AS IT TRAVELS?

S. China, MTU

• How is the filter prepared for the microscope?

• Describe the scanning electron microscope.

VIDEO NOTES:

VIDEO: HOW AEROSOL PARTICLES ARE PHOTOGRAPHED

Click here for the video!!

• Measure the particles you classified yesterday1. Measure scale (500 nm = _____ cm) on each

image2. Carefully measure the perimeter, maximum

length and maximum width.3. Convert measurements to nanometers using

the conversion from the scale.4. Convert measurements so they all have the

same units(1000 nm = 1.00 µm)

Tell the story of particles 2, 9, 11, 12

MEASURING PARTICLES