Heat and Thermodynamics Prelab
1
Temperature and Pressure
The pressure in a container of ﬁxed volume
V
is 20 psi when the temperature is 20
◦
C. What
is the pressure when the temperature is 0
◦
C? What is the pressure when the temperature
is 100
◦
C?
1.1
Equations
The ideal gas law states that
PV
=
nRT
where
P
is the pressure in the container of volume
V
, the volume contains
n
moles of an ideal gas,
R
is the universal gas constant, and
T
is the temperature in
kelvin
.
What is the relationship between a temperature expressed in
kelvin
and a temperature expressed in
Celcius
degrees?
1.2
Room Temperature
Let us call the known temperature and pressure
P
1
and
T
1
.
P
1
= 20 psi
The temperature
T
1
is given in Celcius degrees; you need to write it in kelvin.
The container is of ﬁxed volume
V
. You should assume the container is closed and no gas is ﬂowing
into or out of it. The number of moles
n
of the gas is therefore constant. The universal gas constant
R
will not change, either. Because these quantities are constant, we do not need to lable them with

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