Maintaining constant pressure of a gas

In summary, Charles's Law states that the volume of a fixed amount of gas maintained at constant pressure is directly proportional to the absolute temperature of the gas. To maintain a constant pressure of the gas, it is important to put it into a container that is free to expand and contract, so that the pressure of the gas will always be equal to the external atmospheric pressure. This allows for changes in temperature to be balanced by changes in volume, maintaining a constant pressure.
  • #1
gkangelexa
81
1
i have a rather silly question involving PV = nRT and Charles's Law.
Charles's Law states that the volume of a fixed amount of gas maintained at constant pressure is directly proportional to the absolute temperature of the gas.

I'm wondering about how do you maintain a constant pressure of the gas?... because when you increase the temperature, the pressure of the gas also wants to increase because the molecules have more kinetic energy.

How, in general, do you maintain constant pressure of a gas?
 
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  • #2
You can maintain a constant pressure on the gas by putting it into a container that is free to expand/contract. This way the pressure of the gas will always be equal to the external atmospheric pressure. If the pressure inside the container is higher than the atmospheric pressure, there will be a net force pushing out against the walls causing the container to expand which will reduce the pressure of the gas inside the container. Similarly, if the pressure inside the container is lower than the atmospheric pressure, there will be a net force pushing inward against the walls of the container causing the container to contract and increasing the pressure of the gas inside the container.
 
  • #3
perfect explanation! thanks so much!
 

Related to Maintaining constant pressure of a gas

1. What is constant pressure of a gas?

Constant pressure of a gas refers to the maintenance of the same pressure level within a closed system, despite changes in volume or temperature. This can be achieved through the addition or removal of gas, or by adjusting the size of the container.

2. Why is maintaining constant pressure of a gas important?

Constant pressure is important in many scientific processes, such as chemical reactions and gas laws. It allows for accurate measurements and consistent results, and helps to ensure the safety and stability of the system.

3. How is constant pressure of a gas maintained?

Constant pressure can be maintained by using a pressure regulator or by adjusting the size of the container to balance changes in volume. In some cases, the addition or removal of gas can also help to maintain a constant pressure level.

4. What factors can affect the constant pressure of a gas?

The constant pressure of a gas can be affected by changes in volume, temperature, and the number of gas particles present in the system. External factors such as atmospheric pressure and the presence of other gases can also impact the pressure level.

5. How is constant pressure of a gas measured?

The constant pressure of a gas is typically measured using a pressure gauge or manometer, which can provide a reading in units such as atmospheres, pascals, or millimeters of mercury. These measurements can then be used to adjust the system to maintain a constant pressure level.

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