How do you calculate the propane capacity of a container with known water capacity?

To determine the propane capacity of a container based on its water capacity, the correct approach involves understanding the relationship between water and propane volumes. Propane is less dense than water, and thus when converting a container's water capacity (measured in gallons or liters) to its propane capacity, a specific conversion factor is utilized.

In this case, multiplying the water capacity by 42% reflects the actual volume of propane that the container can hold. This percentage comes from industry standards which indicate that propane occupies approximately 42% of the volume of an equivalent water capacity due to differences in density.

Therefore, using this method ensures a precise calculation of liquid propane capacity from a container's water capacity, making it the appropriate and most accurate choice for this question.