1. Systems

2. Time constant or Lifetime Time for content to drop to 37% of its starting values if all inflow has stopped. Red-??? minutes Blue 50 minutes

3. Time constant or Lifetime Time for content to drop to 37% of its starting values if all inflow has stopped. Red-20 minutes Blue 50 minutes

4. Time Delay: delay between cause and effect Time it takes to close the gap (between content and equilibrium content) to 37% of its initial value. Red 10 minutes (60*0.37=22) Blue ?? minutes

5. Time Delay: delay between cause and effect Time it takes to close the gap (between content and equilibrium content) to 37% of its initial value. Red 10 minutes (60*0.37=22) Blue 20 minutes

6. What is the life time?

7. Answer: about100 minutes

8. What is the life time?

9. Answer: about 6 yrs

10. The water tank structure and methyl chloroform. Methyl chloroform (1,1,1-trichloroethane, C2H3Cl3) has been used as a solvent for adhesives, for metal degreasing, and in dry cleaning. Some cases of neurological disorders have been reported in workers with high exposures to methyl chloroform. Because each molecule contains three potential ozone-destroying chlorine atoms, atmospheric concentrations of methyl chloroform were closely monitored in the late 1980s and 1990s

11. Methyl chloroform is scientifically interesting since it is primarily removed from the atmosphere by the hydroxyl radical, OH, Prinn et al (1987). The methyl chloroform concentration over time, along with an estimate of its atmospheric lifetime, can hence be used to estimate the relatively elusive concentration of the hydroxyl radical. The hydroxyl radical is very important for air pollution and air quality studies as it helps remove many pollutants, including the greenhouse gas methane, from the atmosphere by oxidation. Knowing the lifetime of methyl chloroform helps atmospheric scientist estimate OH concentrations and hence the lifetime of Methane in the atmosphere. Knowing the atmospheric lifetime of methane is essential for estimating it global warming potential relative to carbon dioxide.