What is a key indicator of a propane tank's current content level?

A gauge on a propane tank provides a clear indication of the current content level. This gauge typically shows the percentage of propane remaining in the tank, allowing users to monitor usage and plan for refills.

While the smell of gas can alert users to a leak or issue, it does not indicate the actual volume of propane in the tank. The weight of the tank can give a rough estimate of whether it is empty or full, but measuring weight is less practical for day-to-day monitoring and lacks precision in determining the exact level. The color of the tank, while it may offer some information about the type of tank or its condition, does not provide any factual data regarding the amount of propane it contains.