Catalog · Physics of COVID-19 Transmission Lecture 30 of 49 Video 4-4: Safety Guideline for COVID-19—Steady Transmission Rate ← Previous Video 4-3: Safety Guideline for COVID-19—Transient Transmission Rate Next → Video 4-5: Safety Guideline for COVID-19—Transient Aerosol Buildup ✓ Mark complete Materials Transcript (PDF) ↗ transcript