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Boyle's law apparatus Add to product list. Boyle's law is based on data obtained with a J-tube apparatus such as this. Boyle studied what happened to the volume of the gas in the sealed end of the tube as he added mercury to the open end. The table below contains some of the experi- mental data he reported in his book, New Experiments Physico-Mechanicall, Touching the Spring of Air, and its Effects.
The first column is the volume of the gas in the sealed end of the J-tube, in arbitrary units. The third column is the product of the volume of the gas times the pressure.
At the same time its pressure decreases. One important demonstration of Boyle's law is our own breathing. Inhaling and exhaling basically means increasing and decreasing the volume of our chest cavity. This creates low pressure and high pressure in our lungs, resulting in air getting sucked into our lungs and leaving our lungs.
In this activity you will create your own demonstration of Boyle's law. Observations and Results Did you see the air inside the air-filled balloon contract and expand? Without closing the tip of the syringe with your finger, you can easily push on the plunger. The air can escape through the opening at the tip of the syringe.
But when you close the syringe with your finger the air can't escape anymore. If you press on the plunger, you increase the pressure of the air and thus the air in the balloon contracts or decreases its volume. You should have seen the air-filled balloon shrivel up and get smaller in size. The opposite happens when you close the opening of the syringe and pull the plunger back.
This time you decrease the pressure of the air inside the syringe—and its volume increases. As a result the air-filled balloon expands and grows in size: a perfect demonstration of Boyle's law! The results look different with the water-filled balloon. Although you are compressing the air inside the syringe when pressing on the plunger, the water inside the balloon does not get compressed.
The balloon stays the same size. The water balloon also keeps its shape when pulling out the plunger while closing the tip of the syringe. In contrast to gases, liquids are not compressible as their particles are already very close together. Boyle's law only applies to gases. If you filled the syringe with water as well, you should still have seen the air-filled balloon shrinking while pushing the plunger into the syringe.
The air-filled balloon also should have expanded when pulling the plunger out while the tip of the syringe was closed. You might have noticed, though, that you were not able to push and pull the plunger in and out as far as you could with the air-filled syringe. This is again because of the fact that liquids cannot be compressed like gases.
You should have observed that also when trying to push the plunger in or pull it back in the water-filled syringe with the water-filled balloon. What is the only factor needed to calculate change in velocity due to acceleration of gravity 9. What term is used to describe splitting a large atomic nucleus into two smaller ones. Vaping Study Guide 3 cards.
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