noun. A mixture of butter and suger. A mixture of butter and suger. The definition of a mixture is a combination of different things, or the state or act of being mixed. 1  An example of a mixture is a bowl of butter, sugar and salt. 2  An example of mixture is the process of combining flour and baking soda.
deuterium oxide. An isotope of water in which hydrogen has been displaced by its isotope deuterium. Its properties differ from ordinary water in that it has higher freezing and boiling points and is incapable of supporting life.
Deuterium is an isotope of hydrogen that contains a proton and a neutron in the nucleus of the atom. The extra neutron doubles the mass of the hydrogen atom.It is well-known that due to its mass difference, deuterium (D) behaves differently from hydrogen in chemical reactions (called the isotope effect).euterium is an isotope of hydrogen that contains a proton and a neutron in the nucleus of the atom. The extra neutron doubles the mass of the hydrogen atom.