11. CO₂ (carbon dioxide) exists in what phase when the pressure is 60 atm and the temperature is 20°C? Refer to Fig 13 - 23. 12. What is the lowest pressure and temperature at which CO₂ can be a liquid? Refer to Fig 13-23.
Kinetic Theory of Gas
The Kinetic Theory of gases is a classical model of gases, according to which gases are composed of molecules/particles that are in random motion. While undergoing this random motion, kinetic energy in molecules can assume random velocity across all directions. It also says that the constituent particles/molecules undergo elastic collision, which means that the total kinetic energy remains constant before and after the collision. The average kinetic energy of the particles also determines the pressure of the gas.
P-V Diagram
A P-V diagram is a very important tool of the branch of physics known as thermodynamics, which is used to analyze the working and hence the efficiency of thermodynamic engines. As the name suggests, it is used to measure the changes in pressure (P) and volume (V) corresponding to the thermodynamic system under study. The P-V diagram is used as an indicator diagram to control the given thermodynamic system.
![11. CO₂ (carbon dioxide) exists in what phase when the pressure is 60 atm and the temperature is
20°C? Refer to Fig 13 - 23.
12. What is the lowest pressure and temperature at which CO₂ can be a liquid? Refer to Fig 13 - 23.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe591ff8b-7fbf-41eb-ab1a-65fc8e854653%2F550900e4-ced5-458e-b3db-eae0a2b6b4f0%2Ftka7azs_processed.jpeg&w=3840&q=75)
![obnazaron S
At 1 atm, the freezing point of water
that at a pressure of 1 atm, the substa
is between 0°C and 100°C, but is in t
below 0°C or above 100°C. The cur
pressure curve. Sublimation refers
solid changes directly into the vap
phase. For water, sublimation occu
0.0060 atm. Carbon dioxide, which
even at atmospheric pressure (Fig
The intersection of the three
water this occurs at T = 273.16
triple point that the three phases
triple point corresponds to a uni
cisely reproducible and is often
standard of temperature is usua
of water, rather than 273.15 Ka
Notice that the solid-liquid
the left. This is true only of subs
sure, a lower temperature is ne
substances contract upon free
as shown for carbon dioxide (
The phase transitions we
substances, however, can exi
from one phase to another c
like ordinary phase changes.
forms at very high pressure.
helium I and II. They exist c
zero. Helium II exhibits v
It has essentially zero visco
up the sides of an open cc
computer and TV monitor
phase between liquid and
378 CHAPTER 13 Temperature and Kinetic Theory
P (atm)
FIGURE 13-23 Phase diagram for
carbon dioxide.
73
56
5.11
Solid
Triple
point
S-V
Liquid
l-v
Vapor
In
-56.6
T (°C)
Critical
point
20
I
I
1
1
I
31](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe591ff8b-7fbf-41eb-ab1a-65fc8e854653%2F550900e4-ced5-458e-b3db-eae0a2b6b4f0%2Ftz33i0r_processed.jpeg&w=3840&q=75)
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