Will a 8x4 beam support a 16 foot floor span?

Whether an 8x4 beam can support a 16-foot floor span depends on the load it will carry and the type of material used. Typically, an 8x4 (which I assume refers to an 8-inch by 4-inch beam) may not adequately support a 16-foot span for standard residential loads without additional support, such as posts or a different beam size. It's crucial to consult local building codes and a structural engineer for precise calculations and recommendations based on the specific application.