Helium Arc Discharge: Buoyancy-Driven Arc Bowing (2D)

This 2D companion replaces the 3D version's orbiting particle-field visual with an actual arc model: the plasma channel is a Verlet-integrated rope pinned to two electrode tips, and every point on it feels an upward buoyant force scaled by the helium-fraction slider — the same convective lift that makes real free-burning arcs bow and elongate faster in light gases than in air. That elongation isn't just cosmetic: it feeds the classic Ayrton arc equation live, so stretching the arc by raising current or buoyant lift visibly drives the voltage, resistance and power readouts, exactly the feedback loop that produces "arc blow" on real welding and switchgear arcs.