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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 will decrease because it will exit through the tube opening.
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Does the volume of air enclosed in the bottle increase or decrease?
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The volume of enclosed air in the bottle also decreases because when the bottle is squeezed, it stays in that form and therefore is less room for air inside the bottle after squeezing.
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Does the pressure in the bottle increase or decrease?
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The pressure in the system will remain the same because the open end causes air to continuously flow in and out of the bottle causing the pressure to neither build up or drain out.
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Does the temperature of the air in the bottle increase or decrease?
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The temperature of the air inside of the bottle must decrease because the volume decreases inside the bottle and temperature and volume are directly proportional.
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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 amount of air in the system remains the same because now the air has nowhere to leave the system.
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Does the volume of air enclosed in the system increase or decrease?
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The volume remains constant in the system because the bottle cannot be compressed because the air in the system has nowhere to escape to allow the bottle to be squeezed and remain crushed down.
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Does the pressure in the system increase or decrease?
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The pressure in the system will increase if the bottle is squeezed with the cap on.
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Does the temperature of the air in the system increase or decrease?
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The temperature in the system increases because the pressure in the system increases and in this case temperature and pressure are directly proportional.
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&#Good responses. Let me know if you have questions. &#