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course Phy 232
Brief Bottle Experiment 1A: Basic concepts of N, P, V, TIt is assumed that you have read through the file Physics_II_Initial_Bottlecap-and-tube_Experiments.htm, which will familiarize you with the bottlecap and tube and some of their uses.
The bottlecap can be screwed onto a typical soft-drink bottle. It probably won't work on a bottle which isn't designed for the higher pressure of a carbonated drink, such as a water bottle or some tea bottles. A larger bottle is preferable, but any size will work adequately. A clear bottle is preferable to a colored bottle since you're going to sometimes want to see what's happening inside the bottle, and a darkly colored bottle won't allow this.
Screw the bottlecap onto a bottle and squeeze the bottle. It should be no surprise that if the tube isn't capped, this will force air out of the tube.
Comparing the state of the bottle before and after you squeeze:
Does the amount of air in the bottle increase or decrease?
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The amount of air in the bottle decreases.
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Does the volume of air enclosed in the bottle increase or decrease?
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The volume of air enclosed in the bottle decreases
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Does the pressure in the bottle increase or decrease?
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The pressure in the bottle would increase momentarily.
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Does the temperature of the air in the bottle increase or decrease?
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The temperature might slightly increase based on the momentary increase in pressure, but this would not be drastic or even noticeable.
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Be sure you have explained all your answers.
Now cap the end of the tube and give the bottle a good squeeze, without straining yourself.
Comparing the state of the bottle before and after you squeeze:
Does the amount of air in the system increase or decrease?
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No air has left the system so the amount of air stays the same.
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Does the volume of air enclosed in the system increase or decrease?
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The volume of the air decreases.
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Does the pressure in the system increase or decrease?
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The pressure of the system increases as the volume decreases and the amount of air stays the same.
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Does the temperature of the air in the system increase or decrease?
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Once again, the temperature would increase slightly and momentarily.
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&#Very good work. Let me know if you have questions. &#