Pressing

displays a menu of physical

 

constants from the fields of chemistry, physics,

 

and quantum mechanics. You can use these

 

constants in calculations. (See “Physical

 

constants” on page 13-25for more information.)

Pressing

takes you to the beginning of the

 

MATH menu.

 

 

See “Math functions by category” on page 13-2for

 

 

details of the math functions.

 

H I N T

 

 

When using the MATH menu, or any menu on the

 

 

hp 39gs, pressing an alpha key takes you straight to the

 

first menu option beginning with that alpha character.

 

With this method, you do not need to press

first.

 

Just press the key that corresponds to the command’s

 

beginning alpha character.

 

Program

 

 

 

Pressing

CMDS displays the list of Program

 

commands

Commands. See “Programming commands” on

 

 

page 18-13.

 

 

Inactive keys

If you press a key that does not operate in the current

 

context, a warning symbol like this ! appears. There is

 

no beep.

 

 

Menus

A menu offers you a choice of items. Menus are displayed in one or two columns.

The arrow in the display means more items below.

The arrow in the

display means more items above.

To search a menu

Press

or

to scroll through the list. If you press

or , you’ll go all the way to the end or the beginning of the list. Highlight the item

you want to select, then press (or ).

1-8

Getting started