Soru

A team of atmospheric chemists investigated the photochemical formation of secondary organic aerosols (SOAs) in a $5\text{ m}^3$ Teflon smog chamber. Across four distinct experimental runs, researchers introduced constant initial concentrations of $\alpha$-pinene ($100\text{ ppb}$) and ozone ($200\text{ ppb}$) into the chamber alongside ammonium sulfate seed aerosols ($15\ \mu\text{g/m}^3$). Chamber temperature was maintained at $298\text{ K}$ and relative humidity at $50\%$. The ultraviolet (UV) light irradiance was set to a different value for each run ($0\text{ W/m}^2$, $25\text{ W/m}^2$, $50\text{ W/m}^2$, or $100\text{ W/m}^2$). After 4 hours of continuous irradiation, the researchers measured the final total SOA mass concentration ($\mu\text{g/m}^3$) produced in the chamber.

Match each experimental component to its correct variable classification.