What is the dissipation rate of odor for 20 grams of cocaine without air current within 30 minutes?

The correct answer highlights the expected dissipation rate of odor for 20 grams of cocaine without air current in a controlled environment over a 30-minute period. In the absence of airflow, substances tend to disperse more slowly due to the lack of forces that might otherwise carry the odor away.

Research indicates that a reasonable estimate for the dissipation rate in such a scenario falls within the range of 1 to 1.5 feet. This range accounts for the natural volatility of cocaine as a substance, its tendency to adhere to surfaces, and the effect of molecular diffusion in stagnant air. The 1-1.5 feet approximation considers that while the odor may spread to some degree, it would not propagate as extensively as it would in the presence of air movement, thereby allowing for only a limited spread of odor.

This understanding of odor dissipation without air currents is essential in fields such as law enforcement and canine training, where it pertains to how scents travel and are detected by animals or odor recognition systems.