Before the 20th century, the term matter included ordinary matter composed of atoms and excluded other energy phenomena such as light or sound. This concept of matter may be generalized from atoms to include any objects having mass even when at rest, but this is ill-defined because an object's mass can arise from its (possibly massless) constituents' motion and interaction energies. Thus, matter does not have a universal definition, nor is it a fundamental concept in physics today. Matter is also used loosely as a general term for the substance that makes up all observable physical objects. COUNT 5
QSN1 In what century was the term matter defined excluding energy phenomena like light and sound? ANS1 20th QSN2 What term is used for the substance that composes all observable physical objects? ANS2 matter QSN3 The mass of an object can come from the motion of its constituents or what other source? ANS3 interaction energies QSN4 What term is used to describe the type of definition that matter would have if all scientists could agree on its definition? ANS4 universal QSN5 Prior to the 20th century, the definition of matter included any object that had mass even when it was in what state?  ANS5 at rest