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Our experimental results are not accurate because of a few reasons which will be discussed soon
There were many errors and we had to draw the graph twice to get accurate readings.
The first error is that for all the experiments, we did not measure the temperature of the gas inside the test tube but the temperature of the agents used to cool/heat the test tube. We cannot put the thermocouple directly into the test tube for the simple reason that measuring the temperature from the test tube itself makes the air in the test tube leak to the outside world and cannot measure the pressure accurately.