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.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '09
 Physics, Thermodynamics, Heat, Kelvin

Click to edit the document details