SS Connection

The idea of the pH scale was first introduced in 1909 by Danish chemist Soren Peder Lauritz Sorensen. He developed it while observing the effect of ion concentration on proteins. He discovered that the concentration of hydrogen ions were important which was how the pH scale was introduced. When it was first developed, the pH scale described two new methods for measuring the levels of acids in substances. His first method was based on electrodes while the second method involved comparing the colors of the samples and a pre-selected set of indicators. The pH scale was revised to its modern form in 1924 and it was also discovered that electromotive force in cells depends on activity rather than the concentration of hydrogen ions. The pH stands for "power of hydrogen," where the "p" stands for potenz, the German word for power and the "H" is the elemental symbol for hydrogen. These days the pH scale is used everywhere to measure how acidic or basic a substance is. You can find them being used in schools, labs and many other places. It's thanks to Soren Peder Lauritz Sorensen that we are able to do this.

A rainbow is made through the separation of colors through a prism. These colors are defined in terms of the wavelengths of light, from long wavelength to short wavelength, from low frequency to high frequency light. A common acronym used when ordering these colors, is "ROY G BIV" also known as "Red Orange Yellow Green Blue Indigo Violet." This order goes from infrared to ultraviolet. The wavelengths are commonly expressed in nanometers with 1 nm = 10^-9 m. The visible spectrum is roughly from 700 nm (red end) to 400 nm (violet end).