I did a practical to determine the density of water and oil, the practical succeed but some quesions were arise. So I hope your help for solve these problems.
I did this practical using a u shaped tube, and the density was determined by the height of each liquid due to the pressure.
When I do this practical my text books says we should add high density liquid first and then lower density liquid.
Also when we messure the heights of the liquids (due to pressure) if I want to change the heights to get various messurements(the messurements are taking to draw the chart) the text book says we should add the lower density liquid.
Can you say the reasons for these two situations?
In first situation why firstly add high density liquid?
In second situation why we add the lower density liquid to get various messurements? Why we can't add water to get various messurements? What is the problem? Thank you