A natural gas element used in non-destructive testingRefers to a range of techniques and methods used to assess the integrity, quality, and properties of materials, components, or structures without causing damage…, hydrogenA natural gas element used in non-destructive testing, hydrogen is a chemical element with the symbol "H" and atomic number 1. It is the lightest and most abun… is a chemical element with the symbol "H" and atomic number 1. It is the lightest and most abundant element in the universe, comprising of about 75% of its elemental mass. Hydrogen is a colorless, odorless, and highly flammable gas.