sentence: Units of mass are used to measure the amount of matter in something.
sentences_before: Mass, not weight, can be transformed into energy. Another way of expressing this idea is to say that matter can be transformed into energy.
sentences_after: The mass or the amount of matter in something determines how much energy that thing could be changed into.
concept_name: unit of mass
headings: Albert Einstein Mass-energy equivalence
categories: 1879 births 1955 deaths Americans of German descent Cardiovascular disease deaths in the United States German Jews German physicists Jewish American scientists Naturalized citizens of the United States Nobel Prize in Physics winners