Gas in a syringe being compressed - thermodynamic processes

In summary, gas compression is the process of reducing the volume of a gas by applying external pressure, resulting in an increase in gas density and pressure. As the gas is compressed, its temperature increases due to adiabatic heating, which also increases its internal energy. According to Boyle's Law, the pressure and volume of a gas are inversely proportional, meaning that as the volume decreases during compression, the pressure increases. There are two types of gas compression: isothermal and adiabatic. In isothermal compression, the temperature remains constant while volume and pressure change, while in adiabatic compression, the temperature increases, resulting in a larger change in pressure and volume.
  • #1
domingoleung
7
1
Homework Statement
1. When the gas in a syringe was quickly compressed for 10s, pressure and temperature increased initially. Finally, pressure and temperature decreased. When the gas was naturally released, the pressure and temperature decreased initally. Finally, the temperature increased. What thermodynamic processes were gone through by the system?

2. Explain briefly why the final pressure cannot return to the inital atmospheric pressure
Relevant Equations
PV=nRT
1.
Adiabatic compression (When compressed quickly, there is no heat flow to the environment Q=0)
Isochoric with heat loss (The syringe is still compressed, there should be no change in volume)
Adiabatic expansion (When the syringe is released, there is work done only)
Isochoric with heat gain (The syringe is released entirely, there should be no change in volume)2.
Still I have no idea :(
 
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  • #2
What does naturally released mean?

When the syringe reaches thermal equilibrium with the surroundings, its volume is larger, right, and its temperature is back to the starting value?
 

FAQ: Gas in a syringe being compressed - thermodynamic processes

1. What is thermodynamics?

Thermodynamics is the branch of physics that deals with the relationships between heat, energy, and work. It studies how these factors affect the behavior of matter and the physical properties of a system.

2. How does gas behave when compressed in a syringe?

When gas is compressed in a syringe, the molecules are forced closer together, resulting in an increase in pressure. This causes the gas to become more dense and the volume to decrease. The temperature of the gas may also increase due to the compression.

3. What are the different thermodynamic processes that can occur during gas compression in a syringe?

The three main thermodynamic processes that can occur during gas compression in a syringe are isothermal, adiabatic, and isobaric. In an isothermal process, the temperature of the gas remains constant. In an adiabatic process, there is no heat exchange between the gas and its surroundings. In an isobaric process, the pressure of the gas remains constant.

4. How does the ideal gas law apply to gas compression in a syringe?

The ideal gas law, PV = nRT, can be used to describe the behavior of gases during compression in a syringe. This equation relates the pressure (P), volume (V), number of moles (n), and temperature (T) of a gas. As the volume decreases and the pressure increases during compression, the temperature may also increase, following the ideal gas law.

5. What factors affect the efficiency of gas compression in a syringe?

The efficiency of gas compression in a syringe can be affected by several factors, including the type of gas, the initial volume and pressure of the gas, and the rate of compression. The properties of the syringe, such as its material and size, can also impact the efficiency of the compression process.

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