Sharp EL-W531X Operation Manual page 20

Exponential, Logarithmic
<Example 2>
1000000
1000000
0.434
1000000
Air is held inside a cylinder of volume V
pressure P (= 1,000,000 Pa) at 27°C with a piston.
1
Find the quantity of thermal energy Q needed to expand the air
at constant temperature to a pressure of P
Q = p
Operation
0.01
101000
1000000
101000
19
p
1
V In p
1 1
2
p V
p
1 1 log
1
p
0.434
2
0.01
(= 0.01 m 3 ) at a
1
(= 101,000 Pa).
2
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