   This is the graph for regular air. After the oxygen is burned out, the pressure falls. Because the air is 80% nitrogen and 20% oxygen, A perfect result would be from maximum pressure to minimum pressure, a 20% decrease. These results are close because the peak of pressure is very high. To see why the pressure goes up, see the Analytic essay. Compared to the other trails, the percentage of error was 0%. This is the graph for 40% oxygen 60% nitrogen. After the oxygen is burned out, the pressure falls. Becuase the air is 60% nitrogen and 40% oxygen, a perfect result would be from maximum pressure to minimum pressure, a 40% decrease. Except for trail 8, the results are very close. To see why the pressure goes up, see the Analytic essay. Compared to the other trails, the percentage of error was 2.378%. This is the graph for 50% oxygen 50% nitrogen. After the oxygen is burned out, the pressure falls. Becuase the air is 50% nitrogen and 50% oxygen, a perfect result would be from maximum pressure to minimum pressure, a 50% decrease. These results are not very close. It is possible that because there was so much oxygen being burned, the lime water could not absorb all the carbon dioxide, transforming all the pressure from pressure from oxygen to pressure from carbon dioxide. To see why the pressure goes up, see the Analytic essay. Compared to the other trails, the percentage of error was .5111%.