Oleic acid is the prime constituent of corn oil, and is non-toxic. You will have to measure its density by weighing a known volume. We will first use the nebulizer ahead of the filter, in position 2 marked on the duct, and then after the filter, position 1 marked on the duct. While the nebulizer is in each position, we will measure the concentration of particles downstream of the collector using the API Aerosizer you used earlier this semester. Use the correct flow for representative sampling that you determined in your earlier experiment.
Efficiency then is determined from .
This equation is used for particles in each size range to develop a fractional efficiency curve for the filter. For good experimental technique, first measure the counts downstream with the nebulizer in position 2, then measure counts with the nebulizer at position 1, then repeat the measurement at position 2. For your calculation, use the average number of counts from position 2 from the replicate measurements. Each measurement should be about one minute long. Report Outline briefly what you did.