Aerosols

Question 1

Aerosol

Answer 1

Liquid or gas suspended in a gas

Question 2

Particle

Answer 2

Small, discrete object

Question 3

Particulate

Answer 3

Object with particle-like properties

Question 4

Dust

Answer 4

Solid particle generated by mechanical action

Question 5

Fume

Answer 5

Solid particle formed by vapor condensation

Question 6

Mist

Answer 6

Liquid droplets generated by condensation or atomization

Question 7

Smoke

Answer 7

Fine particulates generated from combustion

Question 8

Fiber

Answer 8

Particulate with a minimum aspect ratio of 3:1

Question 9

Monodisperse

Answer 9

Aerosol of single sized particles

Question 10

Polydisperse

Answer 10

Aersol of multiple sized particles

Question 11

Characteristics that affect particle behavior

Answer 11

Physical diameter, density, shape

Question 12

Stokes diameter

Answer 12

Diameter of a sphere that has the same density and settling velocity as the particle

Question 13

Aerodynamic diameter

Answer 13

Diameter of a unit density sphere with the same settling velocity of the particle

Question 14

Stokes Law (description, not equation)

Answer 14

Allows for estimation of Vts, need particle diameter and density

Question 15

Cunningham slip correction factor

Answer 15

Additional variable for Stokes Law, used for particles smaller than 1 um

Question 16

Reynold’s number

Answer 16

Dimensionless ratio between inertial and frictional forces, describes if flow is turbulent or laminar

Question 17

Laminar flow

Answer 17

Re < 0.1, frictional forces dominate

Question 18

Turbulent flow

Answer 18

Re > 250, inertial forces dominate

Question 19

Relaxation time

Answer 19

Time it takes for particle to reach settling velocity

Question 20

Stopping distance

Answer 20

Distance a particle travels in still air

Question 21

Count distribution

Answer 21

Based on number of particles in each size range, dominated by smaller particles, characterized by count median diameter (CMD)

Question 22

Mass distribution

Answer 22

Based on mass of particles in each size range, dominated by larger particles, characterized by mass median diameter

Question 23

Particle distributions tend to be ___ distributed

Answer 23

lognormally

Question 24

Isokinetic sampling

Answer 24

Outside air stream matches probe air stream

Question 25

Filter properties include

Answer 25

Pore size, fiber vs membrane

Question 26

Filter selection influenced by

Answer 26

aerosol properties and analytical methods

Question 27

Glass filter used for

Answer 27

oil mists, pesticides

Question 28

MCEF used for

Answer 28

metals, asbestos, dusts

Question 29

PVC

Answer 29

Dusts, Cr VI, chromic acid

Question 30

PTFE

Answer 30

Volatiles

Question 31

Cascade impactor

Answer 31

Uses inertial forces to deposit different sized particles onto series of collection plates

Question 32

3 regions of respiratory system

Answer 32

Head, tracheobronchial, alveolar region

Question 33

Diameter of inhalable fraction

Answer 33

100 um

Question 34

Diameter of thoracic fraction

Answer 34

10 um

Question 35

Diameter of respirable fraction

Answer 35

4 um

Question 36

Byssinosis

Answer 36

Asthma-like condition due to cotton dust exposure