CHEMISTRY QUESTION! If the volume increases, does it mean pressure increases as well? What if volume decreases? When can we get a constant pressure? Please explain. Thank you.

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CHEMISTRY QUESTION! If the volume increases, does it mean pressure increases as well? What if volume decreases? When can we get a constant pressure? Please explain. Thank you.

Chemistry
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Great question
Let's say we have this formula PV = nRT And say we keep pressure constant. Remember we need to keep one variable constant in order to understand the relationship between the other two. So at constant pressure it becomes this V1/T1 = V2/T2 This means that when we keep the pressure constant the volume and temperature are directly proportional to one another that means if one quantity goes up so does the other.
Say if you want to study the relationship between volume and pressure. We would have to keep the temperature constant. So it becomes P1V1 = P2V2 When you increase the volume the pressure goes down and when you decrease the volume the pressure goes up. So imagine if we had say 1 mole of gas X Pressure = the number of times the gas particles hit the walls of the container And volume is the amount of space our gas has to move around. If we take that one mole of gas X and put it into a very small container, with a small volume, the gas is going to hit the walls of the container a lot and the pressure will go up. Say also if we took that same one mole of gas X and we put it into a very large container where we make the volume bigger, what will happen? Well because the gas has much more space to move around it won't hit the walls of the container as much as it did in the previous example and we will get a lower pressure.

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Like the most important thing is we can only study like how two variables relate at the same time like pressure or temperature, Volume and temperature, and keep the third variable constant. Play around with the formula and see how the variables relate and then all that boules law Charles law stuff you won't need to memorize because it's all in the formula PV = nRT
Very helpful. Thank you

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