3.1.3. Microscopic and Macroscopic Concepts

Try these first

1. 1.

   What is the formula for density?

   Hint

   Think about what mass and volume refer to in the context of fluids.

2. 2.

   Define specific gravity.

   Hint

   Consider why water is often used as a reference.

3. 3.

   What is the main property measured by viscosity?

   • Resistance to flow
   • Density
   • Pressure

   Hint

   Think about what makes maple syrup thicker than water.

4. 4.

   True or False: Specific gravity is the weight of a liquid compared to air.

   • True
   • False

   Hint

   Remember the reference substance for specific gravity.

5. 5.

   If a tank contains a fluid with a specific gravity of 1.2, calculate its density. How does it compare to water?

   Hint

   Use the relationship between specific gravity and water density.

6. 6.

   A fluid in a pipe has a viscosity of 0.8 Pa.s. If the shear stress is 4 Pa, what is the velocity gradient?

   Hint

   Recall the relationship between shear stress and viscosity.