What is the primary composition of commercial propane?

The primary composition of commercial propane typically consists of around 90% to 95% propane and a small percentage of other hydrocarbons, which can include propylene and a few trace gases. Therefore, the choice indicating 95% propane and propylene along with 5% of other gases accurately reflects the general specification for commercial-grade propane.

In practical applications, slight variations can occur due to the presence of other hydrocarbons like butanes or butylenes, and this composition allows for optimal performance in heating, cooking, and industrial applications. Recognizing that commercial propane can contain a mixture of gases, rather than pure propane, is essential for understanding its properties and uses in fire investigation and safety contexts. This aspect of propane's composition underlines the importance of analyzing the physical and chemical characteristics of fuels when investigating fire-related incidents.