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PH 108.1 - Physical Pharmacy (Lab) > MIDTERM 02 - Viscosity and Rheology > Flashcards

MIDTERM 02 - Viscosity and Rheology Flashcards

1
Q

Title of Experiment 3

A

Viscosity determination

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2
Q

Refers to the internal friction or resistance of fluid to flow

A

Viscosity

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3
Q

Symbol for viscosity

A

η (Eta)

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4
Q

A branch of physics which deals with the deformation and flow of matter

A

Rheology

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5
Q

Type of flow that follows the Newtonian flow of direct proportionality between shearing stress and rate of shear

A

Newtonian flow

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6
Q

Castor oil (Type of flow)

A

Newtonian flow

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7
Q

Chloroform (Type of flow)

A

Newtonian flow

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8
Q

Ethanol (Type of flow)

A

Newtonian flow

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9
Q

Water (Type of flow)

A

Newtonian flow

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10
Q

Olive oil (Type of flow)

A

Newtonian flow

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11
Q

Type of flow characterized by the change in viscosity with increasing rate of shear

A

Non-Newtonian flow

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12
Q

3 types of non-Newtonian flow (PPD)

A

Plastic flow/Bingham body, Pseudoplastic flow, Dilatant flow

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13
Q

Yield value/yield stress must be applied to cause them to flow; its behavior is plasticity (Types of Non-Newtonian flow)

A

Plastic flow/Bingham body

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14
Q

Cerates (Type of Non-Newtonian flow)

A

Plastic flow

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15
Q

Cataplasm (Type of Non-Newtonian flow)

A

Plastic flow

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16
Q

Cream (Type of Non-Newtonian flow)

A

Plastic flow

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17
Q

Ointment (Type of Non-Newtonian flow)

A

Plastic flow

18
Q

Butter (Type of Non-Newtonian flow)

A

Plastic flow

19
Q

Pasta margarine (Type of Non-Newtonian flow)

A

Plastic flow

20
Q

Characterized by shear thinning behavior; an increased rate of shear leads to decreased velocity (Types of Non-Newtonian flow)

A

Pseudoplastic flow

21
Q

Natural and synthetic gum (Type of Non-Newtonian flow)

A

Pseudoplastic flow

22
Q

Liquid dispersion or tragacanth (Type of Non-Newtonian flow)

A

Pseudoplastic flow

23
Q

Characterized by shear thickening behavior; an increase in viscosity leads to an increase in rate of shear (Type of Non-Newtonian flow)

A

Dilatant flow

24
Q

Paint (Type of Non-Newtonian flow)

A

Dilatant flow

25
Q

Starch suspension in water (Type of Non-Newtonian flow)

A

Dilatant flow

26
Q

Inorganic pigment in water (Type of Non-Newtonian flow)

A

Dilatant flow

27
Q

2 instruments used for determining viscosity (SM)

A

Single point viscometer, Multi-point viscometer

28
Q

Operate at a single rate of shear (Instruments used for determining viscosity)

A

Single point viscometer

29
Q

Operate at a variety of shear (Instruments used for determining viscosity)

A

Multi-point viscometer

30
Q

Type of single point viscometer that is based on the rate of flow of liquid through an orifice

A

Capillary viscometer

31
Q

2 examples of capillary viscometer (SO)

A

Saybolt viscometer, Ostwald viscometer

32
Q

2 types of multi-point viscometer (CC)

A

Cup & Bob, Cone & Plate

33
Q

Type of multi-point viscometer based on the resistance to rotation of metallic body in contact with or immersed in the liquid

A

Cup & Bob

34
Q

Type of multi-point viscometer based on the resistance to rotation of a metal cone in content with liquid in stationary phase

A

Cone & Plate

35
Q

Example of Cup & Bob viscometer; the cup is stationary and the bob/rotator is revolving

A

Stormer viscometer

36
Q

Example of Cone & Plate viscometer

A

Ferrati Shirley viscometer

37
Q

Refers to the ratio of density and time of sample over density and time of water (Type of viscosity)

A

Absolute viscosity

38
Q

Refers to the number of times the sample is more viscous than the standard (Type of viscosity)

A

Relative viscosity

39
Q

Type of viscometer used for light liquid

A

Ostwald viscometer

40
Q

Refers to the time wherein the substrate are pumped out of the cell or the time required for the liquid to pass from mark A to mark B

A

Efflux time

PH 108.1 - Physical Pharmacy (Lab) (6 decks)

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