A numerical-value equation is an equation between
quantities in which just the values of the quantities occurs but not the
unit of measurement. Therefore, the
equation requires to be used with the values the quantity has in a specific unit. A numerical value equation always has to be marked as such.
Numerical value equations are in contrast to quantity equations. Quantity equations hold independently of the unit used to express the value of the quantity.
For example, a quantity equation for
displacement ''d'' as
speed ''s'' multiplied by time difference ''t'' would be:
:''d''=''s'' ''t''
for ''s''=5m/s and ''t'' and ''d'' in any units.
In contrast, a numerical-value equation would be:
:''D''=5 ''T''
for ''T'' in seconds and ''D'' in metres.
Generally, the use of numerical value equations is discouraged.
See also
*
Dimensional analysis
References
{{Reflist
Physical quantities