There are three gas laws that we have learned. I learned to use PTV to show me what will happen to the volume, temperature, or pressure if one of them is constant.
The Charle's Law is where the pressure stays constant. The temperature and volume are directly related. So they both go up and both go down at the same time. One experiment that showed Charles Law was when we placed a balloon in the liquid nitrogen. The balloon shrunk due to the temperature change. The pressure stayed constant, but the volume and the temperature changed. A real life example is when you leave a balloon out in the sun, where it can get heated up. The volume of the balloon increases until it can not grow any larger and then it explodes.
The Boyle's Law is when the temperature is constant. The pressure and the volume are indirectly related. Which is when the pressure increases and then the volume will decrease. If the volume increases and then the pressure will decrease. One experiment we did that showed Boyle's Law was with the marshmallow and the syringe. The temperature did not change during this experiment, but the pressure and the volume of the marshmallow did. When pulling out the syringe the marsh mellow grew larger because there was less pressure on it. When we pushed the syringe in the marshmallow shrunk because there was more pressure on it. A real life example is when you squeeze a balloon so much that it pops. The temperature does not change when you pop the balloon. When squeezing the balloon it caused there to be more pressure which made the balloon pop and the volume of the balloon decreased.
The Gay- Lussac's Law is where the volume is constant. The pressure and temperature are directly related. One experiment we did that showed Gay-Lussac's law was the Egg in the bottle. When we placed the flask in the ice the egg fell into the flask. The temperature went down and so did the pressure. Which is why the egg was ale to go through the opening. A real life example of Gay-Lussac's Law is when a car tire is heated up, the pressure increases on the inside of it. Since the volume of the tire stays constant the tire might explode.
Wednesday, November 7, 2012
Friday, August 31, 2012
Pipette Project
Miranda Clausen
August 28, 2012
Materials needed for this experiment 5 Pipettes, One empty 2 liter pop bottle, Water,Weights, and Tape. Safety concerns would be bottle cap flying off and water spillage. Goal is to get all 5 pipettes to go down 1, 2, 3, 4, 5 and then back up 5, 4, 3, 2, 1.
The procedure would be first to get all the materials together. Now fill the 2 liter pop bottle with water, but leave at least an inch or two of air in the bottle. Now tape a weight on to the pipette, but not to big of a weight and fill the pipette with a small amount of water. Put the pipette with the weight inside of the 2 liter pop bottle. It should float because the pipette is less dense than the water. If it sinks that means it is more dense than the water and need to put on a smaller weight. Put the cap on the pop bottle and squeeze the pop bottle.The pipette should sink. The air inside of the pipette becomes compressed and the water enters the pipette; which makes the pipette more dense than the water, so it sinks. Now stop squeezing the pop bottle. The pipette will rise to the top now because the water is released out of it and it is now less dense than the water.
The 4 other pipettes will need different amounts of water in each of them. With the different amounts of water in each of them they will go down at different times. The more water in the pipette the faster it will sink. The less amount of water the slower it will sink. Put the same weights on all 5 of the pipettes. The density of water is 1 g./ml., so the pipette must be less dense than water.
All 5 of the pipettes should now be put into the pop bottle. Put the cap on it and squeeze the bottle slowly so that the pipettes go down one at a time. Release slowly after all 5 pipettes are down at the bottom. If you release slowly they should come up one at a time. If this does not work, try putting different amounts of water in the pipettes.
We did not figure out the project until we saw another group do it. We also did not get to the Cartesian Divers or the other where it had to float in the middle and the rise back up.
It did take us awhile to figure it out, but after we got it, it seemed easy and fun. A hydraulic lift is something else that uses the Pascal's Principle. We were amazed at first to see how they worked and how it was possible for them to go down and come back up without touching them, but that just shows us how much we still have to learn.
August 28, 2012
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| These are pipettes. |
The procedure would be first to get all the materials together. Now fill the 2 liter pop bottle with water, but leave at least an inch or two of air in the bottle. Now tape a weight on to the pipette, but not to big of a weight and fill the pipette with a small amount of water. Put the pipette with the weight inside of the 2 liter pop bottle. It should float because the pipette is less dense than the water. If it sinks that means it is more dense than the water and need to put on a smaller weight. Put the cap on the pop bottle and squeeze the pop bottle.The pipette should sink. The air inside of the pipette becomes compressed and the water enters the pipette; which makes the pipette more dense than the water, so it sinks. Now stop squeezing the pop bottle. The pipette will rise to the top now because the water is released out of it and it is now less dense than the water.
The 4 other pipettes will need different amounts of water in each of them. With the different amounts of water in each of them they will go down at different times. The more water in the pipette the faster it will sink. The less amount of water the slower it will sink. Put the same weights on all 5 of the pipettes. The density of water is 1 g./ml., so the pipette must be less dense than water.
All 5 of the pipettes should now be put into the pop bottle. Put the cap on it and squeeze the bottle slowly so that the pipettes go down one at a time. Release slowly after all 5 pipettes are down at the bottom. If you release slowly they should come up one at a time. If this does not work, try putting different amounts of water in the pipettes.
We did not figure out the project until we saw another group do it. We also did not get to the Cartesian Divers or the other where it had to float in the middle and the rise back up.
It did take us awhile to figure it out, but after we got it, it seemed easy and fun. A hydraulic lift is something else that uses the Pascal's Principle. We were amazed at first to see how they worked and how it was possible for them to go down and come back up without touching them, but that just shows us how much we still have to learn.
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