What is the purpose of analyzing Nitrox cylinder contents before a dive?

Analyzing the Nitrox cylinder contents before a dive is crucial for verifying accurate oxygen levels. This is because Nitrox blends differ in their oxygen content, and knowing the precise percentage of oxygen is essential for safe diving. Each mixture has specific depth limits beyond which oxygen toxicity can occur due to elevated partial pressures of oxygen. By analyzing the contents, divers can ensure they are using an appropriate blend for their planned dive profile, enabling them to plan their dive safely and avoid potential risks associated with improper gas mixes.

The other options, while they are important aspects of dive preparation, do not specifically address the primary reason for analyzing Nitrox tanks. Ensuring that the tank is full does not confirm the correct gas mixture for the dive. Avoiding stale air pertains more to regular air rather than Nitrox-specific considerations. Checking for leaks is a safety check but does not relate to the analysis of the gas mixture itself, which is the primary goal when preparing for a dive with enriched air nitrox.