Fundamentals of Gas and Optical Science

1. 📌 Essentials

• Ozone-depleting substances: NO, N₂O, CFC; CO₂ does not deplete ozone.
• Ideal gas law: PV = nRT; at S.T.P., 1 mole occupies 22.4 L.
• Molecular mass calculation: $\text{Molecular mass} = \frac{\text{Mass}}{\text{Volume}/22.4}$.
• Gas volume at S.T.P.: 11.2 L corresponds to 0.5 mol.
• Bubbles: Act as convex lenses due to refraction.
• Concave: Ray through center of curvature reflects back along the same path.
• Standard conditions: 1 mol gas = 22.4, 0°C, 1 atm.
• Material ratios: α : β : γ = 1 : 2 : 3 (or as given).
• Environmental concern: CFCs cause ozone depletion; CO₂ does not.
• Optical reflection: Incident ray through the center of curvature retraces its path.
• Behavior of gases: Follow ideal gas law under standard conditions.

2. 🧩 Key Structures & Components