Princeton's WordNet (2.25 / 4 votes) Rate this definition: unit of measurement, unit (noun). any division of quantity accepted as a standard of measurement or exchange. the dollar is the United States unit of currency; a unit of wheat is a bushel; change per unit volume. unit (noun).nit. 1. Any military element whose structure is prescribed by competent authority, such as a table of organization and equipment; specifically, part of an organization. 2. An organization title of a subdivision of a group in a task force.
Oxygen can be found on most of the earth and is needed by many living beings. Our atmosphere is composed of about 20% oxygen. The element oxygen (O2) is found in water (H2O),â¦ which is made up of 2 parts Hydrogen and 1 part oxygen. It is also found in rust and metal ores, as well as in many different minerals. Another place is anywhere there are green plants or trees.
Heavy water, D 2 O, is water in which both hydrogen atoms have been replaced with deuterium, the isotope of hydrogen containing one proton and one neutron.It is present naturally in water, but in only small amounts, less than 1 part in 5,000.inally, the resulting deuterium is reacted with oxygen to form heavy water. No nuclear transformations occur. The production of heavy water in significant amounts requires a technical infrastructure, but one which has similarities to ammonia production, alcohol distillation, and other common industrial processes.