# Heating a Nichrome wire around a glass tube

• swallace36
In summary, the conversation discusses using a nichrome wire and a battery to heat a glass tube for a vaporizer. The student is in the early stages of research and wants to know if this is a feasible approach. The speaker suggests using pyrex glass or insulating the wire to prevent localized heating and mentions the option of buying heating wire at different voltages. They also mention the concern of cracking from localized heating and suggest using a potentiometer to adjust the temperature.
swallace36
Hello,

Stupid computer scientist student speaking here.

I am looking to heat a few inch long glass tube with a OD of around 10mm and wall around 1.5mm wrapped in Nichrome wire to around 365F. Air will then be drawn through the tube to heat up herbs sitting about the glass tube. (vaporizer) I want to use a battery to heat the wire. I will probably put another glass tube around the inside one to keep with wire from being exposed.

Does this sound plausible? I am in the very rough stages of research but NEED to find out if I am headed in the right direction...

A hot nichrome wire can be used to cut glass through heat induced expansion stress. See you tube. There are few videos. So you don't want that.

You might want to use pyrex glass or insulate the wire from localized heating. You can can also buy lengths of heating wire taking various standard voltages.

I would think cutting the glass wouldn't be a concern between 355-385F and I imagine you wouldn't want to exceed 400F but you would presumably need to adjust the temperature for calibration, and perhaps for preference... so you need to figure out how much energy you need to bring the length of wire to 400F and add a suitably rated potentiometer.

A concern would be cracking from localized heating where the NiCr alloy contacts the glass.

## 1. How does heating a Nichrome wire around a glass tube work?

When an electric current is passed through a Nichrome wire, the wire heats up due to its high electrical resistance. This heat is then transferred to the glass tube, causing it to also heat up. The heat from the wire is evenly distributed around the tube, making it an effective method for heating.

## 2. What are the advantages of using Nichrome wire for heating a glass tube?

Nichrome wire has a high melting point and is able to maintain its strength and resistance even at high temperatures. It also has a low coefficient of thermal expansion, meaning it will not expand or contract significantly when heated or cooled. These properties make Nichrome wire a reliable and durable choice for heating a glass tube.

## 3. How do I choose the right Nichrome wire for my glass tube heating needs?

The right Nichrome wire for heating a glass tube will depend on factors such as the desired temperature, the size and material of the tube, and the power source being used. It is important to consult with a specialist or do thorough research to determine the appropriate type and gauge of Nichrome wire for your specific application.

## 4. Can Nichrome wire be used for heating other materials besides glass?

Yes, Nichrome wire can be used for heating a variety of materials including metals, ceramics, and plastics. However, it is important to consider the melting point and electrical conductivity of the material to ensure the Nichrome wire is suitable for the job.

## 5. Are there any safety precautions to keep in mind when heating a Nichrome wire around a glass tube?

Yes, it is important to handle the Nichrome wire with care as it can become very hot when in use. Make sure to use appropriate protective gear and handle the wire with insulated tools. It is also important to monitor the heating process closely and turn off the power source when not in use to prevent overheating or potential fire hazards.

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