The potential of Hydrogen, or pH, scale was invented by the Danish biochemist Soren Peter Lauritz Sorensen. He introduced this scale in 1909 to measure the acidity and basicity of substances. More » History Inventions

The pH scale is a logarithmic scale used to measure acidity. The pH scale measures how basic or acidic a substance is, and it ranges from 0 to 14. On the pH scale, a pH of 7 is neutral, less than 7 is acidic and higher t... More » Science Chemistry Acids & Bases

Sulfuric acid has a pH of 0.3 at a normality of 1 N, a pH of 1.2 at 0.1 N and a pH of 2.1 at 0.01 N. When using molar concentration, sulfuric acid has a pH of 2.75 at 1 millimole per liter, a pH of 1.87 at 10 millimoles ... More » Science Chemistry Acids & Bases
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Giuseppe Mercalli invented the Mercalli intensity scale in 1902 as a way to measure the effects of an earthquake. The scale is based off of the observations of the people who experienced the earthquake. More » History Inventions

The hardness scale, or the Mohs Hardness Scale, was developed by Friedrich Mohs, a German geologist and mineralogist, in 1812. This qualitative test was the first widely used field test among geologists. More » History Inventions

The pH range for Sorensen’s sodium phosphate buffer is 5.8 to 8. The pH range for 0.2M sodium dihydrogen phosphate and disodium hydrogen phosphate stock solutions were determined by Sorensen. Hence, the buffer solution i... More » Science Chemistry Acids & Bases

Hydrogen does not exist in pure form in nature and instead is produced from a primary energy source, such as fossil fuels, solar, geothermal and wind energy, or extracted from other elements such as oxygen. Hydrogen is f... More » Science Chemistry Atoms & Molecules