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E-25
To select this constant:
Input this scientific
constant number:
molar volume of ideal gas (Vm) 26
molar gas constant (R) 27
speed of light in vacuum (C
0
)28
first radiation constant (C
1
)29
second radiation constant (C
2
)30
Stefan-Boltzmann constant (σ)31
electric constant (ε
0
)32
magnetic constant (
µ
0
)33
magnetic flux quantum (
φ
0
)34
standard acceleration of gravity (g) 35
conductance quantum (G
0
)36
characteristic impedance of vacuum
(Z
0
)37
Celsius temperature (t)38
Newtonian constant of gravitation (G) 39
standard atmosphere (atm) 40
Power Supply
The type of battery you should use depends on the model
number of your calculator.
fx-991MS
The TWO WAY POWER system actually has two power
supplies: a solar cell and a G13 Type (LR44) button battery.
Normally, calculators equipped with a solar cell alone can
operate only when relatively bright light is present. The
TWO WAY POWER system, however, lets you continue
to use the calculator as long as there is enough light to
read the display.
•Replacing the Battery
Either of the following symptoms indicates battery power
is low, and that the battery should be replaced.
•Display figures are dim and difficult to read in areas
where there is little light available.
• Nothing appears on the display when you press the
5 key.