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.
This is the sense used in 'eau de toilette' - it's a perfumed water you keep on your dressing table and use when dressing. 5. By the mid-18th century 'toilet', more often spelt and pronounced in the French way as 'toilette', could also mean the result of that activity: that is to say, one's outfit and appearance as a whole. ('Everyone at the ball agreed that Esmeralda's toilette was charming'.) This meaning continued alongside the others. 6.