Adjustments to the concentration of water and salts within the urine takes place mainly in the distal parts of the tubules and in the collecting tubules, by altering the permeability of the membranes of cells lining the nephron walls. These changes are brought upon to two hormones, ADH and aldosterone.
Use for Colorimetric and Turbidimetric Determinations. These photometric colorimeters use specific light filters to give readings on a unique KlettTM scale. The readings are directly proportional to the concentration or optical density of a solution, in accordance with Beers Law.
Using Planimeter on Map. A small device called planimeter is used for measuring areas of a graphically represented planar region. The planimeter can measure all regular and irregular shapes. All you have to do is to pivot it at any point and then run the end pin all over the perimeter of the area you want to measure.