Gas Laws

Gases are not similar to solids and liquids. Particles in gases move around very quickly and sporadically, with nothing to hold them in. So, they can expand extremely far distances.  Liquids, on the other hand, have particles that don’t move as quickly and are partially constricted. Solids have particles that move extremely slowly and are confined. Today in class, we performed a lab about gas laws (go figure). In the lab, we got a large jar and sealed it with an rubber cork and used it to begin filling the jar with water using a tube and funnel. Since the jar is sealed, it holds a certain amount of air. When we filled the jar with water, the air became more compressed because there was more particles in the same volume of space. The air continues to be compressed until it reaches it’s maximum compression point and the water stops flowing into the jar, because there is no more space for it. As we changed the height of the tube, the amount of water allowed in the jar changed as well. When the tube and funnel were up high, the more water could go through. This is because the added pressure on the water going straight down is pushing against the pressure inside the jar. Similarly, the least amount of water went in the jar when the funnel was the lowest it could go. The added pressure is lost as the water has to wind it’s way through the tube into the jar. This can tell us that there is a relationship between the volume of the container and the pressure of the gas. The more substances you put in the jar, the higher the gas pressure will be. This is because the more substances you add the more particles are occupying the same volume as before. So the gas is forced to compress in order to fit in the jar, and the gas pressure increases.

sources: class lab


douglas measuring the volume of the jar


the tube and funnel and their lowest level


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