Chemical Change A change that produces one or more new substances and may release energy. Chemical Property A second set of properties in all kinds of matter. Circuit A path that is made from an electrical current. Claws A sharp, usually slender, and curved nail on the toe of an animal.
Answer Wiki. There is really only one measure of time, and that is hours/minutes/seconds/days/weeks/months/years. Then you have derivations of these including Lunar years, light years, periods between full moons, days (between sun rises), but they all come back to the traditional time of hours/minutes/seconds. Views.
The clock is one of the oldest human inventions, meeting the need to consistently measure intervals of time shorter than the natural units: the day, the lunar month, and the year. Devices operating on several physical processes have been used over the millennia.