ENVS 2060 Lecture Notes - Lecture 10: Graduated Cylinder, Hydrometer, Pipette
31 Mar 2016
School
Department
Course
Professor
Document Summary
Disperse soil in a graduated cylinder with na: because of it"s larges hydrated radius, it separates the aggregates/plates and releases them into suspension, calculate time required for particles of a given size to a given depth. Particle size bigger ones will fall faster. Particle density vs. solution density higher density diference the faster it will drop. N = viscosity of water (ro)ro = soil particle density (ro)w = water density r = particle radius. K x r2 = velocity: brady and weil r = d. V = h t v = kr2 h t. Sand smallest diameter = 0. 05mm (diameter /2 = r =0. 0025cm) t = h. Silt smallest diameter = 0. 002mm (r=0. 0001cm) t = h. Explains why silt settled in small lakes during glacial periods. Put pipette to the depth speciied (ie. 10cm), slowly draw up the liquid, put onto a pie plate and let it dry, examine the soil content.
