mfb said:If you insulate your system well enough (that is not trivial), reaching that temperature is easy.
Controlling the temperature can be interesting.
To make a hot wire with a 9V battery, you will need a 9V battery, a wire, and a resistor. The wire should be thin and have a high resistance, such as nichrome wire or stainless steel wire. The resistor will help regulate the current and prevent the wire from overheating.
The temperature of the wire will depend on the resistance of the wire and the amount of current passing through it. Generally, with a 9V battery, the wire can reach temperatures between 200°C and 300°C. However, this can vary depending on the type of wire and battery used.
No, it is not safe to touch the wire while it is hot. The wire can reach high temperatures that can cause burns. Always use caution and protective gear when handling hot wires.
The easiest way to control the temperature of the hot wire is by using a variable resistor. This will allow you to adjust the amount of current passing through the wire and thus control the temperature. You can also use a thermometer to monitor the temperature and adjust the current accordingly.
A hot wire made with a 9V battery can be useful for cutting or shaping materials that are sensitive to high temperatures, such as styrofoam or plastic. It can also be used for soldering or welding small objects. Additionally, it can be used in science experiments or demonstrations to show the effects of electricity on different materials.