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10 Cards in this Set
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- Back
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WHAT IS VELOCITY GRADIENT
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rate of shear (dv/dr), is the difference of velocity (dv) between two planes of liquid seperated by the distance (dr). the force (F'/A) appllied to the top layer that is required to result in flow (rate of shear, G) is called shearing stress (F)
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what are the equations for velocity gradient
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F'/A = n (dv/dr)
n = F/G F = F'/A G = dv/dr |
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what is the pH range of anionic surfactants
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greater than 7
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what is the pH range of cationic surfactants
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3 to 7
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what is the pH range of nonionic surfactants
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3 to 10
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HLB of O/W emulsifiers
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8-18
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HLB of antifoaming agents
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0-3
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HLB of wetting agents
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7-9
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HLB of detergents
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13-15
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HLB of solubilizing agents
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10-18
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