I am working on a lab, that was to test charle's law. In order to do so, I filled a conainer with salted water, that had a pippette taped on the inside of it. I then inserted it in the freezer and observed it's temperature as the water volume rose in the pippette. I then took the volume of water data and found the volume of air in the pipette by subtraction .After creating a graph of volume air versus Temperature, I extrapolated the graph in order to find what the estimate Temperature would be at Volume zero of air. My answer was -160C , of course we all know the correct temperature is -273.15C. Now I have to explain what the possible erros are, I have most, however the instructions said to explain how the water vapour in the air could be affecting the calculations. And to estimate how much it could be affecting the calculations.