Conditions Of Equilibrium Of Floating And Submerged Bodies

floating bodies equilibrium conditions

A floating or submerged body is said to be stable if it comes back to its original position after giving a slight disturbance. The condition of stability of these bodies depends on the position of its metacentre, centre of buoyancy and centre of gravity. The relationship between these points and the stability of body is described below.

Differentiate Centre Of Gravity, Centre Of Buoyancy And Metacentre?

cetre of gravity metacente centre of buoyancy

Centre of gravity

Centre of gravity is an imaginary point at which the weight of body can be assumed to act. For a uniformly distributed mass, the centre of gravity will be same as the geometrical centre of that object. The concept of centre of gravity helps us to design of static objects, predict the behaviour of moving objects.

How Liquid Pressure Measured Using Piezometer


What is Piezometer?

Piezometer is the simplest form of liquid pressure measuring device. It measures the gauge pressure of liquid in a system by measuring the height up to which the column of liquid rise against the gravity. Measured liquid column height is known as piezometric height.

Absolute Pressure, Gauge Pressure and Vacuum Pressure

Gauge, absolute, vacuum pressure

The pressure on a fluid is measured in different system.

Absolute pressure:  When pressure is measured with reference to absolute vacuum pressure then it is called absolute pressure. At this pressure, the molecular momentum is zero.

Gauge pressure: This is the pressure measured by of pressure measuring instrument, in which atmospheric pressure is taken as datum (reference). The atmospheric pressure is taken as zero in this system. The instrument used to measure this pressure is known as Pressure gauge. The pressure always used to indicate the pressure above atmospheric pressure.

Application, Advantages and Disadvantages of Cavitation

Application, Advantages and Disadvantages of Cavitation

Read: What is Cavitation?

Advantages and application of cavitation

  • Cavitation found application in ultrasonic cleaning baths. It has sufficient force to overcome the adhesive force between molecules of impurity and clean surface.
  • Controlled cavitation phenomenon can be used to enhance a chemical reaction.
  • Cavitation process uses to homogenize and mix the suspended particles in colloidal liquids.
  • Cavitation used to improve the performance of high-speed marine vessels and projectiles.
  • Cavitation in wastewater treatment - extreme cavitation use to break down pollutants and organic molecules.

What Is Cavitation, And Its Effects And Precautions Against Cavitation?

propeller cavitation image

What is cavitation?

Cavitation is the phenomenon of formation of a vapour bubble in flowing liquid where the pressure falls below vapour pressure and sudden collapsing of this bubble at high-pressure region. Cavitation usually the result of rapid changes of pressure of the liquid. The cavitation cause erosion of surface as well as noise and vibrations. The cavitation occurs in pumps, orifice, venturi meter, control valves, impellers, etc.