HP Prime Graphing Calculator - Manual (Page 454)

450 Units and constants
3. Select Physics.
4. Select c:
299792458.
5. Square the speed of
light and evaluate
the expression.
jE
Value or
measurement?
You can enter just the value of a constant or the constant
and its units (if it has units). If is showing on the
screen, the value is inserted at the cursor point. If
is showing on the screen, the value and its units are
inserted at the cursor point.
In the example at the
right, the first entry shows
the Universal Gas
Constant after it was
chosen with
showing. The second
entry shows the same
constant, but chosen
when was
showing.
Tapping displays , and vice versa.