Mathematica
BUILT-IN MATHEMATICA SYMBOL

Quantity

Quantity[magnitude, unit]
represents a quantity with size magnitude and the unit specified by unit.

Quantity[unit]
assumes the magnitude of the specified unit to be 1.

Details and OptionsDetails and Options

  • Quantity has attribute HoldRest and preserves the structure of unit.
  • With the option setting ThreadDepth->d, Quantity[list, unit] will automatically thread the specified unit to depth d of list.
  • The specified unit should be a string or operation of strings representing the Quantity expression's unit value.
  • Quantity[unit] will produce a canonicalized Quantity with a magnitude of 1.
  • Quantity expressions can be created by using the Ctrl+Equal WolframAlpha interface.
  • Quantity will automatically attempt to parse an unknown unit string to its canonical form.
  • Supported units include all those specified by NIST Special Publication 811.

ExamplesExamplesopen allclose all

Basic Examples (4)Basic Examples (4)

A Quantity represents a value associated with a specific unit:

In[1]:=
Click for copyable input
Out[1]=

A unit can be a string or a product of strings:

In[1]:=
Click for copyable input
Out[1]=
In[2]:=
Click for copyable input
Out[2]=

Valid unit specifications include a number of physical constants:

In[1]:=
Click for copyable input
Out[1]=
In[2]:=
Click for copyable input
Out[2]=

Quantity will automatically attempt to interpret an unknown unit string:

In[1]:=
Click for copyable input
Out[1]=
In[2]:=
Click for copyable input
Out[2]=

Scope (4)Scope (4)

Options (1)Options (1)

Properties & Relations (2)Properties & Relations (2)

Possible Issues (3)Possible Issues (3)

Top
New in 9.0
Send Feedback
Mathematica 9 is now available!

400+ new features, including the new Wolfram Predictive Interface, social network analysis, enterprise CDF deployment, and more »

Try Now
Buy/Upgrade
New to Mathematica? Find your learning path »
Have a question? Ask support »