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course phy 202
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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When you squeeze the bottle the air will decrease.
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Does the volume of air enclosed in the bottle increase or decrease?
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When you squeeze the bottle the volume of air enclosed decreases.
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Does the pressure in the bottle increase or decrease?
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The pressure increases when the bottle is being squeezed.
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Does the temperature of the air in the bottle increase or decrease?
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The temperature of air would increase as well.
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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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The bottle before hand is normal but when you squeeze it the volume of air decreases but the pressure increases as well as the temperature of the air. The amount of air will decrease as you squeeze the bottle and then increase again when the bottle is returned to its normal state.
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Does the volume of air enclosed in the system increase or decrease?
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The volume of air enclosed in the system will decrease because you are pushing it out as you squeeze the bottle.
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Does the pressure in the system increase or decrease?
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The pressure would increase because you are making a smaller surface for the air in the bottle.
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The pressure does increase very slightly, but because the bottle is open to the atmosphere it doesn't increase much. Just enough to force the air out.
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Does the temperature of the air in the system increase or decrease?
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I believe the temperature of the air would increase because it is moving out of the bottle.
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&#Good responses. See my notes and let me know if you have questions. &#