Return the total mass of three tennis balls:

Output the luminosity of two suns:

Output the material out of which three (separate) footballs are made:

EntityCopies expressions can be used alongside regular entities in lists:

Extensive property values of EntityCopies yield the total value of all copies:

Since volume is extensive, the value for two basketballs is twice the volume of a single basketball:

Non-extensive property values of EntityCopies repeat their value for each copy:

Computed values of multiple copies of an entity may return a combination of total value plus a list of values for properties of differing type (i.e. some extensive and some not):

EntityValue treats an EntityGroup of n copies of an entity in the same way as EntityCopies[entity,n]:

Extensive property values for no copies return 0:

Intensive property values for no copies return an empty list:

EntityCopies remains unevaluated for a single copy:

Operations on an EntityCopies expression containing a single copy are equivalent to those on a normal Entity:

Verify equality:

Attempting to give an invalid entity count returns an appropriate form of Missing:

EntityCopies expressions can be returned in differing units than analogous quantities:

Verify equality: