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Captions
Gas discharge tubes showing a spectral range of colors from the noble or inert gases - helium (He), neon (Ne), argon (Ar), krypton (Kr) and xenon (Xe).
Tubos de descarga de gas mostrando el rango espectral de colores de los gases nobles o inertes - helio (He), neón (Ne), argón (Ar), kriptón (Kr) y xenón (Xe).
Tubes à décharge gazeuse montrant une gamme spectrale de couleurs provenant des gaz nobles ou inertes - hélium (He), néon (Ne), argon (Ar), krypton (Kr) et xénon (Xe).