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Mechanical Properties of Real 
Fluids and Solids 
Presented by 
Ken Bole and Brian Sabino 
Page 2


Mechanical Properties of Real 
Fluids and Solids 
Presented by 
Ken Bole and Brian Sabino 
Overview 
• Fluids 
• Viscosity 
• Plasticity of Metals 
• Nonlinear Elastic Materials 
• Linear and Quasi-linear Viscoelastic Bodies 
• Viscoplastic Materials 
Page 3


Mechanical Properties of Real 
Fluids and Solids 
Presented by 
Ken Bole and Brian Sabino 
Overview 
• Fluids 
• Viscosity 
• Plasticity of Metals 
• Nonlinear Elastic Materials 
• Linear and Quasi-linear Viscoelastic Bodies 
• Viscoplastic Materials 
Fluids 
Two types based on pressure-volume relationship 
Page 4


Mechanical Properties of Real 
Fluids and Solids 
Presented by 
Ken Bole and Brian Sabino 
Overview 
• Fluids 
• Viscosity 
• Plasticity of Metals 
• Nonlinear Elastic Materials 
• Linear and Quasi-linear Viscoelastic Bodies 
• Viscoplastic Materials 
Fluids 
Two types based on pressure-volume relationship 
Fluids (cont.) 
Gaseous fluid equation of state 
RT pV ?
Relates pressure (p), volume (V) and absolute 
temperature (T), and 
k N R
0
?
where N
0
 is Avogadro’s number and k is 
Boltzman’s constant 
Page 5


Mechanical Properties of Real 
Fluids and Solids 
Presented by 
Ken Bole and Brian Sabino 
Overview 
• Fluids 
• Viscosity 
• Plasticity of Metals 
• Nonlinear Elastic Materials 
• Linear and Quasi-linear Viscoelastic Bodies 
• Viscoplastic Materials 
Fluids 
Two types based on pressure-volume relationship 
Fluids (cont.) 
Gaseous fluid equation of state 
RT pV ?
Relates pressure (p), volume (V) and absolute 
temperature (T), and 
k N R
0
?
where N
0
 is Avogadro’s number and k is 
Boltzman’s constant 
Fluids (cont.) 
For liquids, we have Van der Waals eqn. 
RT V
V
p ? ?
?
?
?
?
?
?
? ) (
2
?
?
where ?/V
2
 is the attractive force between gas 
particles, and ? is the molecular volume of the 
particles 
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FAQs on Mechanical Properties of Fluids Notes - MCAT Chemical and Physical Foundations

1. What are the mechanical properties of fluids?
Ans. The mechanical properties of fluids refer to the characteristics of fluids that describe their behavior under mechanical forces. These properties include viscosity, density, surface tension, compressibility, and elasticity.
2. How is viscosity defined and measured?
Ans. Viscosity is a measure of a fluid's resistance to flow. It is defined as the internal friction or stickiness of a fluid. Viscosity can be measured using various methods, such as the capillary tube method, the falling ball method, or the rotational viscometer method.
3. What is the significance of density in fluid mechanics?
Ans. Density is a measure of how much mass is contained in a given volume of a substance. In fluid mechanics, density is significant as it affects the buoyancy of objects in fluids, determines the pressure distribution in fluids, and plays a role in fluid flow and fluid dynamics calculations.
4. How does surface tension affect the behavior of fluids?
Ans. Surface tension is the force that acts on the surface of a liquid, causing it to behave like a stretched elastic sheet. It affects the behavior of fluids by causing them to form droplets, capillary rise in narrow tubes, and form menisci. Surface tension also contributes to the cohesion and adhesion of fluids.
5. What is the difference between compressibility and elasticity in fluids?
Ans. Compressibility refers to the ability of a fluid to be compressed or reduced in volume when subjected to an external force. Elasticity, on the other hand, refers to the ability of a fluid to return to its original shape or size after the external force is removed. While both properties involve deformation, compressibility relates to volume changes, whereas elasticity relates to shape changes in fluids.
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