What is the main difference between Roman Tuba and Modern Tuba?

The main difference between the Roman tuba and the modern tuba lies in their construction and usage. The Roman tuba, an ancient brass instrument, featured a straight design and was primarily used in military and ceremonial contexts, producing a bright and piercing sound. In contrast, the modern tuba is a larger, coiled instrument with a wider bore, designed for a richer, deeper tone and versatile use in orchestras, bands, and solo performances. Additionally, the modern tuba has valves that allow for greater agility and a wider range of notes compared to the Roman tuba.