To create a boiling tube that heats to 200°C using a 9V battery, a coil of wire is suggested, but a standard PP3 9V battery may not provide sufficient current, as it typically supplies only 300-400 mA for a short duration. A more effective option would be a 12V 7.2 AH Gel or sealed Lead-Acid battery, which can deliver the necessary current for longer periods. Achieving 200°C can be done with a thin wire that glows red at around 2A, while using a thinner wire could reach this temperature with just 200mA. Proper insulation of the system is crucial for maintaining the desired temperature. Overall, using the right wire material, such as tungsten, and ensuring adequate insulation are key factors in successfully heating the system.
