Which material property improvement enabled ancient Chinese gunpowder rockets to achieve greater range?

💡 Explanation

Greater rocket range stems from higher motor pressures. The use of cast iron tubes enabled the **tensile strength increase**, because cast iron resists the hoop stress that can rupture weaker materials, therefore containment improves pressure, rather than alternative factors related to propellant or aerodynamics.

• Which outcome occurred when Roman torsion siege engines like the ballista exceeded wooden frame constraints?
• Which maintenance risk impacted longevity of Mughal pietra dura?
• Which mechanism limited the distance Roman torsion siege engines, like the ballista, could accurately launch projectiles?
• Which limitation increased for mariners using astrolabes on long sea voyages?
• Which soil property decreased when early Andean cultures implemented terrace farming on steep slopes?
• Which limitation arises when terraced hillside farming encounters prolonged periods of heavy rainfall?