Hello, my question is on investigating the uptake of oxygen by organisms using respirometers. I just don't understand how in this case (in the explantation) when the volume of oxygen decreases, the pressure inside the tube decreases? Because if organism take up the oxygen there'll be even less gas, so how can pressure increase?
Answers
Hey mate, here the coloured liquid gives us the volume of oxygen. As we know volume is inversely proportional to pressure so, as the insect takes up the coloured liquid there is a reduction in volume in the tube which increases the pressure and this results the coloured liquid to move from higher to lower concentration of pressure. Pressure and volume are interlinked here. This process is based on this two quantities.
As u are asking that if the organism takes up the oxygen there will be even more reduction of coloured liquid in the tube. This is what the process is about. Only if there is reduction of volume in the tube the pressure will increase and then only it will tend the oxygen to move towards low concentration area of pressure.
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