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For example, in (inch) is defined as .0254 n, and Fdy (Faraday) is

defined as 96487 H*s. (See appendix E for a complete listing of the

built-in units and their SI values.)

A umt object has two parts: a number (a real number) and a umt

expression (a single unit or multiplicative combination of units). The

two parts are linked by the underscore character For example,

2._in (2 inches) and 8= 302L.9.Eil.--''h (8.303 US gallons per hour) are

unit objects. Like other object types, a unit object can be placed on

the stack, stored in a variable, and used in algebraic expressions and

programs.

When you perform a unit conversion, the HP 48 replaces the old unit

expression with a new unit expression you specify, and automatically

multiplies the number by the appropriate conversion factor.

Operators in unit objects follow this precedence order:

! (highest precedence)1.

2. ■ ■ ■ ■ ■

3. * and .■ ■ ■ ■

For example, is 7 meters per second squared, and

is 7 square meters per second squared.

The UNITS Catalog Menu

The UNITS Catalog menu (ff^fUNITS)) displays a three-page menu

of “subject” keys, each of which, when pressed, displays a submenu

of related units. For example, fr^ f UNITS IfNXT) - - displays a

two-page menu of units for pressure.

The individual keys in each submenu behave differently than standard

menu keys, as described throughout this chapter. In Immediate-entry

mode, you can use the shift keys with the menu keys as follows:

■ An unshifted menu key creates a unit object by combining the real

number on level 1 with the unit expression that corresponds to

that key. (In Algebraic- or Program-entry, the unshifted keys act

as typing aids, echoing the corresponding name into the command

line.)

10-2 Unit Objects

1 2 ... 115 116 117 118 119 120 121 122 123 124 125 ... 611 612

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