In the past, a common time measuring instrument was the sundial. Today, the usual measuring instruments for time are clocks and watches. For highly accurate measurement of time an atomic clock is used. Stop watches are

Action describes energy summed up over the time a process lasts (time integral over energy). Its dimension is the same as that of an

Dimensions (size)
Length (distance)
• Length, distance, or range meter
For the ranges of length

Considerations related to electric charge dominate electricity and electronics. Electrical charges interact via a field. That field is called electric field.If the charge doesn't move. If the charge moves, thus realizing an electric current, especially in an electrically neutral

Energy is measured by an energy meter. Examples of energy meters include:
Electricity meter
An electricity meter measures energy directly in kilowatt hours.
Gas meter
A gas meter

A physical system that exchanges energy may be described by the amount of energy exchanged per time-interval, also called power or flux of energy.
• (see any measurement device for power below)
For the ranges of power

This includes basic quantities found in classical- and continuum mechanics; but strives to exclude temperature-related questions or quantities.
Mass- or volume flow measurement
• Gas meter
• Mass flow meter