General Terms

Question 1

Viscosity

Answer 1

A measure of a fluid’s resistance to gradual deformation by shear stress or tensile stress, “thickness”

Question 2

Examples of high-viscous fluids

Answer 2

Honey, syrup, tar

Question 3

Examples of low-viscous fluids

Answer 3

Water, milk, a glass of rosé

Question 4

Dynamic (shear) vs. kinematic viscosity

Answer 4

Kinematic viscosity is dynamic viscosity divided by density

Question 5

Couette flow

Answer 5

The flow of a viscous fluid in the space between two surfaces, one moving tangentially relative to the other

Question 6

Reynolds number

Answer 6

The ratio of inertial forces to viscous forces

Question 7

Newtonian fluid

Answer 7

A fluid where the viscous stresses arising from its flow, at every point, are linearly proportional to the local strain rate (the rate of change of its deformation over time)

Question 8

Froude Number

Answer 8

Ratio of inertial forces to gravity (to the 1/2 power)

Question 9

Richardson Number

Answer 9

Ratio of buoyant forces to inertial forces

Question 10

Rossby number

Answer 10

Ratio of inertial forces to Coriolis forces

Question 11

Boussinesq Approximation

Answer 11

Consider a flow incompressible (by neglecting any effects of density differences) except for the buoyant forces that can arrive from them

Question 12

Euler number

Answer 12

Ratio of the pressure forces to the inertial forces

Question 13

Hydrostatic balance

Answer 13

Gravity and pressure forces are equal