The value of the diameter and the density are 9.5 μm and 1.06 g cm − 3 respectively in a particular batch of polystyrene microspheres. The setting velocity of particles in 1G gravitational field at 20 ° C and the time required to 10 mm sediment of particlesis to be determined. The water density is ρ F = 0.998 g cm − 3 . Concept introduction: The following formula will be used for the calculation of the settling velocity- u = ( ρ − ρ F ) g 18 η d 2 …… (1) Here, u = velocity of particle ρ = density of particle ρ F = density of fluid η = viscosity of the medium d = diameter of the particle g = acceleration due to gravity Also, t = h u Here, h = sedimentation distance u = velocity of the particle t = time

BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213
BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

Solutions

Chapter 34, Problem 34.12QAP
Interpretation Introduction

Interpretation:

The value of the diameter and the density are 9.5 μm and 1.06 g cm3 respectively in a particular batch of polystyrene microspheres. The setting velocity of particles in 1G gravitational field at 20°C and the time required to 10 mm sediment of particlesis to be determined. The water density is ρF=0.998 g cm3.

Concept introduction:

The following formula will be used for the calculation of the settling velocity-

u=(ρρF)g18ηd2 …… (1)

Here,

u = velocity of particle

ρ = density of particle

ρF = density of fluid

η = viscosity of the medium

d = diameter of the particle

g = acceleration due to gravity

Also,

t=hu

Here,

h = sedimentation distance

u = velocity of the particle

t = time

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