HP 33S User Manual

7–4 Solving Equations
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
Example: Solving the Ideal Gas Law Equation.
The Ideal Gas Law describes the relationship between pressure, volume,
temperature, and the amount (moles) of an ideal gas:
P
×
V = N
×
R
×
T
where
P is pressure (in atmospheres or N/m
2
), V is volume (in liters), N is the
number of moles of gas,
R is the universal gas constant (0.0821 liter–atm/mole–K
or 8.314 J/mole–K), and T is temperature (Kelvins: K=°C + 273.1).
Enter the equation:
Keys: Display: Description:
º d h
P
¸

Selects Equation mode
and starts the equation.
h
V
º ¢
h
N
¸
h
R
¸ h
T



Ï

Terminates and displays
the equation.
º Î


Checksum and length.
A 2–liter bottle contains 0.005 moles of carbon dioxide gas at 24°C. Assuming
that the gas behaves as an ideal gas, calculate its pressure. Since Equation mode
is turned on and the desired equation is already in the display, you can start
solving for
P:
Keys: Display: Description:
Û
P

value

Solves for P; prompts for
V.
2
¥

value

Stores 2 in V; prompts fo
r
N.
.005
¥

value

Stores .005 in N;
prompts for
R.
.0821
¥

value

Stores .0821 in R;
prompts for
T.
24
Ï
273.1
Ù


Calculates T (Kelvins).


HP 33S Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Silver
Digits	10 digits
Display number of lines	2 lines
Keyboard type	Alphanumeric
Menus and prompts	Yes

Weight and Dimensions

Dimensions (WxDxH)	157 x 16 x 81 mm