Environmental Chemistry
Homework Assignment 11 (20 points)
- What is the settling velocity of a particle having a Stokes diameter of 10 μm and a density of 1 g/cm3 in air at 1.00 atm pressure and 0 °C? (The viscosity of air at 0 °C is 170.8 micropoise. The density of air under these conditions is 1.29 g/L.)
- Per unit mass, why are smaller particles more effective catalysts
for atmospheric chemical reactions?
- The size distribution of particles emitted from coal-fired power plants is bimodal. What are some of the properties of the smaller fraction in terms of potential environmental implications?
- Particulate matter in the atmosphere interacts with light in several
different ways. Use diagrams and words to describe the physical processes
involved in each of the following terms, as they relate to atmospheric
visibility.
a. Forward Scattering
b. Backward Scattering - Describe a situation, using a diagram if necessary, where a viewer
would perceive atmospheric haze to appear "dark."
ENV 440 Homework