Does Air Entering an Evacuated Bottle Perform Work?

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In summary, an evacuated bottle is a container that has been emptied of all air and gas, creating a vacuum inside. Air can enter through diffusion, where molecules move from an area of high concentration to low concentration. This happens due to a difference in pressure, and it is difficult to prevent entirely. The implications of air entering an evacuated bottle vary depending on its use, but it can affect the accuracy of experiments, contaminate products, and impact shelf life. To slow down the rate of air entering, materials with low gas permeability, such as glass or metal, can be used for the bottle and its cap.
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kini.Amith
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When air enters into an evacuated bottle from atmosphere when the cork is opened, is there any work done by the air? My textbook says that there is , but i thought no work was done during free expansion?
Consider the amount of air entering as the system.
Moreover, is W=∫PdV applicable only for quasi eqbm process or all processes?
 
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  • #2
Some work is done in accelerating the air and in overcoming drag in the neck of the bottle. But whether that's what the textbook author had in mind I've no idea.
 

FAQ: Does Air Entering an Evacuated Bottle Perform Work?

What is an evacuated bottle?

An evacuated bottle is a container that has been completely emptied of air or any other gas. This creates a vacuum inside the bottle, meaning there is no air or gas present.

How does air enter an evacuated bottle?

Air enters an evacuated bottle through a process called diffusion. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. In this case, air molecules outside the bottle will move into the bottle to equalize the pressure.

Why does air enter an evacuated bottle?

Air enters an evacuated bottle because of a difference in pressure. The pressure inside the bottle is lower than the pressure outside, causing the air molecules to move inside in an attempt to equalize the pressure.

Is it possible to prevent air from entering an evacuated bottle?

It is difficult to completely prevent air from entering an evacuated bottle as it is a natural process. However, you can slow down the rate of air entering the bottle by using materials with low gas permeability, such as glass or metal, for the bottle and its cap.

What are the implications of air entering an evacuated bottle?

The implications of air entering an evacuated bottle depend on the purpose of the bottle. For scientific experiments, it can affect the accuracy of results. In industrial processes, it can contaminate products. In both cases, it can also impact the shelf life of the contents in the bottle.

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