space proviided before each item. 1. Which one of the following statements best explains why gases are not commercially sold by volume? A. Gas volume depends on temperature and pressure. B. Gas volume is difficult to measure. C. Gas volume is negligible D. Gases have comparatively low densities. 2. Which of the following quantities occurs constantly where a type of process does not need outside energy to reverse? C. Temperature A. Pressure B. Speed D. Volume 3. Which of the following is an isobaric process? A. No heat enters or leaves the system B. The pressure of the system is constant. 4. What process is involved if a balloon is being expanded very ranid C. The temperature of the system is constant. D. The volume of the system is constant.
Ideal and Real Gases
Ideal gases obey conditions of the general gas laws under all states of pressure and temperature. Ideal gases are also named perfect gases. The attributes of ideal gases are as follows,
Gas Laws
Gas laws describe the ways in which volume, temperature, pressure, and other conditions correlate when matter is in a gaseous state. The very first observations about the physical properties of gases was made by Robert Boyle in 1662. Later discoveries were made by Charles, Gay-Lussac, Avogadro, and others. Eventually, these observations were combined to produce the ideal gas law.
Gaseous State
It is well known that matter exists in different forms in our surroundings. There are five known states of matter, such as solids, gases, liquids, plasma and Bose-Einstein condensate. The last two are known newly in the recent days. Thus, the detailed forms of matter studied are solids, gases and liquids. The best example of a substance that is present in different states is water. It is solid ice, gaseous vapor or steam and liquid water depending on the temperature and pressure conditions. This is due to the difference in the intermolecular forces and distances. The occurrence of three different phases is due to the difference in the two major forces, the force which tends to tightly hold molecules i.e., forces of attraction and the disruptive forces obtained from the thermal energy of molecules.
Intervention
Post Assessment
1-10
![02
The Force exerted b gas
1
Thermodynamics Thermodynamics is comsicher ed with systems
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Reflection Guide:
As a physics student, how can you use thermodynamics in your everyday living? Explain your answer.
Thermodynamics used devices are very convenient to use.
IF there were
clevices in this world it would be
manydifficulties
laws of themo dynamics are obeyed by
Sweat
y the human body. When we sweat in noom. Sweat
vour body, AS more and more heat is absorbed by the sweat it
waporates transferring heat to air.
INTERVENTION
Post-assessment
Directions: Read and understand the questions below. Write the letter of your answer on the space provided before each item.
1. Which one of the following statements best explains why gases are not commercially sold by volume?
A. Gas volume depends on temperature and pressure.
B. Gas volume is difficult to measure.
C. Gas volume is negligible
D. Gases have comparatively low densities.
2. Which of the following quantities occurs constantly where a type of process does not need outside energy to reverse?
C. Temperature
A. Pressure
B. Speed
D. Volume
3. Which of the following is an isobaric process?
A. No heat enters or leaves the system
B. The pressure of the system is constant.
C. The temperature of the system is constant.
D. The volume of the system is constant.
pressure
4. What process is involved if a balloon is being expanded very rapidly?
C. isochoric
5. Which of the following processes is involved if a balloon is being expanded very slowly by the addition of heat?
C. isochoric
A. adiabatic
B. isobaric
D. Isothermal
A. adiabatic
B. isobaric
D. isothermal
6. What process is involved if a balloon is being heated inside a solid metal case?
B. isobaric
A. adiabatic
C. isochoric
D. isothermal
7. What will happen to a volume of a gas under constant temperature if the pressure increases?
A. decreases
B. expands
C. increases
D. remains the same
8. A heat engine moving an efficiency of 0.20 takes in 2000 J of energy from the hot reservoir in one cycle. In the same
time, how much work will it perform?
B. 120 J
f 00
9. Which of the following is an example of reversible process?
D. 1000 J
A. Firing a bullet from a gun
B. Quickly pouring a hot water into cold water
C. Slowly pouring hot water into cold while allowing the container to achieve ambient temperature
D. Striking a match
10. If heat be exchange in a reversible manner, which of the following property of the working substance will change
accordingly?
A. Enthalpy
B. Entropy
C. Internal Energy
D. Temperature
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