![]() You cannot add or subtract quantities of different dimension.Ī dimensionally correct equation need not be true. (a) 0.3 millimeters (b) 50 microseconds (c) 7.2 kilograms Defining the unit precisely would be cumbersome. It would be necessary to measure both mass and volume very accurately in order to use the density of water as a standard. Also, pulsars are highly regular astronomical clocks.ĭensity varies with temperature and pressure. Standards of Length, Mass, and Time Matter and Model-Building Density and Atomic Mass Dimensional Analysis Conversion of Units Estimates and Order-ofMagnitude Calculations Significant FiguresĪtomic clocks are based on electromagnetic waves which atoms emit. ![]()
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