Which effect arose as an unintended consequence when Song dynasty alchemists sought an elixir?

💡 Explanation

Early alchemists inadvertently created gunpowder during elixir experiments using sulfur, charcoal and saltpeter by uncontrolled combustion, a chemical chain reaction; therefore, the explosive compound resulted, rather than immortality, because the mixture's components exceeded reaction thresholds.

• Which agricultural disadvantage becomes limiting on pre-Columbian steep terrace farms in the Andes after sustained rainfall?
• Which structural issue commonly arose when Roman fort designers failed to ensure proper drainage behind defensive walls?
• Which difficulty emerges in historical analysis when relying solely on translated accounts which reference Inca quipu?
• Which outcome of uneven ground slippage occurs when Roman aqueduct foundations undergo micro-displacements?
• Which outcome results from simplifying equations in early Islamic irrigation systems?
• During winter, which outcome reduces the structural integrity of a Roman aqueduct's arched keystone?