Logarithmic scale is one in which the logarithms are plotted as against the linear scale where the values are plotted. That means in log scale, the distance 1-10 will be the same as 10-100, and, will be the same as 100-1000, and, so on. My preference is to use linear scale, though.
Green is the most common glow-in-the-dark color, but red, orange, and other colors also occur. How Glow in the Dark Stuff Works. Find Out What Things Really Glow under a Black Light. Make Glow-in-the-Dark Drinks. How to Make Glow in the Dark Ice. These Radioactive Elements Actually Do Glow in the Dark.
The identity of the gas in the tube determines the color of the glow. Neon emits a red glow, helium produces pale yellow, and argon yields blue. Mercury vapor also emits blue light, and sodium vapor emits yellow.