Make Hot Wire with 9V Battery: 200c/300c

[yup790]

I am planning in making a boiling tube that heats up to about 200c without a flame. I was thinking a coil of wire and a 9v battery (portable is always better). How would I make the wire hot - 200c/300c with only a 9v battery.

 

[mfb]

If you insulate your system well enough (that is not trivial), reaching that temperature is easy.
Controlling the temperature can be interesting.

 

[davenn]

If you insulate your system well enough (that is not trivial), reaching that temperature is easy.
Controlling the temperature can be interesting.

Yup, but it isn't going to be done with one of those small PP3 9V batteries, they just don't have the umph,
they can only supply around 300-400 mA and for a relatively short time
You would need a battery that can supply significant current, say a 12V 7.2 AH Gel or sealed Lead-Acid

Dave

 

[mfb]

I don't know how large the volume we want to heat is.
You can make a thin wire visibly glow red with ~2A, using a thinner wire should easily give 200°C with 200mA.
9 V at 200 mA means 40 Ohm, so we can use a long thin wire (or probably a small resistor).

 

[zoki85]

I think wolfram based wires are very suitable for this.