Viscosity
The measure of the resistance of a fluid to flow is known as viscosity. Most fluids have some resistance to motion, the resistance provided by the fluid is called viscosity. This resistance is created by the force of attraction between the fluid molecules. If you pour water through a funnel, it flows easily and quickly, because it has very little resistance. But if you pour honey through a funnel, it may take a little time longer, as the density of honey is high.
Poiseuille's Law
The law of Poiseuille or Poiseuille's equation states that the pressure drop of an incompressible fluid especially a liquid in a laminar flow that passes through a cylindrical tube of length L, radius r, pressure gradient ΔP, and mainly depends on the viscosity of the fluid is nothing but the pressure difference of the layers of fluids. ΔP=P1-P2
Drag Forces
Forces that occur due to the movement of fluid are known as fluid mechanics. Following are the fluids present:
Why are windows of airplane smaller than bus windows?
On moving up the altitude the pressure decreases. Since the pressure is low at high altitude human beings cannot breathe without aids. Airplanes maintain the inside pressure of the air equivalent to the earth's surface so that the normal human being can breathe properly.
The inside pressure of the airplanes is high in comparison to the outside pressure of the window. Thus, the windows experience a net force toward outward. In the bus the outside pressure is same or there is a very slit difference thus the window of the bus does not experience any resultant force.
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