Water Pressure

Today in class we experimented with water pressure. To begin the lab we had a funnel connected to a long tube that connected to a big jar. The jar was sealed, so there was a limit to how much water we could put in because there was the space was already filled with air. Once we filled the tube with water and no air pockets were left we started to constantly fill up the funnel as it drained. As it was filling up, the air being compressed in the jar became smaller and smaller until it could no longer fit any more water we added. So the water flow stopped once the air was to the point of being completely compressed. We performed this experiment three different times and the only difference was the height of the funnel that led to the jar from the floor: high, medium and low. When we measured the volume of water in the jar we had a total volume of 2,510.0 mL. The final water volume at each of the heights was different because as you adjusted the height of the tube leading from the funnel to the jar, was changed. The tallest height had the most pressure because the water was pouring straight into it, and for the tube at the lowest height became curved and would then have a slower water flow into the jar. In result, for example, when we had our funnel at the highest point which was 172.1 cm there was only 410.0 mL of water that the jar was able to hold because of all the pressure from the gas that was built up in the jar. As you do this lab you have to know the difference between solids, liquids and gases. Solids don’t morph into other shapes unless they are heated; have a structure that makes them much harder than liquids or gases and the molecules in a solid are tightly packed making it unable to change shape or size. Liquids are simply some elements that are liquid at room temperature and they can take the shape of whatever container they are in. Gases can move much faster and are less tightly packed than solids and once heated, they move at a much rapid pace; molecules constantly create collisions between each other.The reason in the experiment that the pressure is changing is because it is being forced into a smaller volume so once the water is being placed inside the jar the molecules from the gas are moving faster. 

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Sources:

Class Experiment

Class Results/ Discussion

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