Composed of a single proton and a single electron, hydrogen is the simplest and most abundant element in the universe. It is estimated that 90% of the visible universe is composed of hydrogen. Hydrogen is the raw fuel that most stars 'burn' to produce energy. The same process, known as fusion, is being studied as a possible power source for use on earth. The sun's supply of hydrogen is expected to last another 5 billion years. Hydrogen is a commercially important element.
Eau de toilette is a lightly scented cologne used as a skin freshener. The term toilette/toilet used in this context describes the process of washing and personal grooming. Eau de toilette is also referred to as aromatic waters and has a high alcohol content.
1 Eau De Toilette (EDT): It is lighter than EDP, with a 4-8% concentration of the essence. 2  It usually lasts for 2 to 4 hours. 3  Eau De Cologne (EDC): It is lighter than EDT, often referred to just as Cologne and has the greatest dilution of fragrances with a 3-5% concentration of perfume essence.