By calculation (generator: ["now@trueknowledge.com"]) I know that:

The current time is April 21st 2014, 13:45:54

By calculation (generator: ["second_parameter@trueknowledge.com"]) I know that:

litre
is the second parameter of
7.2 litres

I know from locally stored knowledge that:

Fact 1:
1
is the multiplier that converts
litre and litre
([fact: ["684486520@trueknowledge.com"]])

Fact 1
is true for
all time
([fact: ["1050414414@trueknowledge.com"]])

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:

Fact 1
is true at
April 21st 2014, 13:45:54

By calculation (generator: ["first_parameter@trueknowledge.com"]) I know that:

7.2
is the first parameter of
7.2 litres

By calculation (generator: ["product@trueknowledge.com"]) I know that:

7.2
is the product of
1 and 7.2

By calculation (generator: ["class_parametered_object@trueknowledge.com"]) I know that:

volume
is the class of the parametered object
7.2 litres

By calculation (generator: ["parametered_object_corresponding_to@trueknowledge.com"]) I know that:

7.2 litres
is the parametered object corresponding to
volume and 7.2 and litre

By calculation (generator: ["equivalent_to6@trueknowledge.com"]) I know that:

Fact 2:
7.2 litres
is equivalent to
7.2 litres

Fact 2
is true at
April 21st 2014, 13:45:54

Fact 2:
litre
is the unit used in
7.2 litres