Home   Tell-A-Friend    Discussion Board   Contact Us

Civil Engineer Sponsored by Webinfolist.com

Educational and Industrial Resources

Treasure of Civil Engineering Resources

Course materials, Books, Computer software, Quiz,  Conferences, Journals, Research theses, Jobs, Products, Services etc.

                                              Fluid and its Properties  
There are three states of matter which are recognised e.g. solid, liquid, gas. Solid can resist deformation but liquid and gas can not., so they flow under the action of force.
A Fluid is defined as a substance which deforms continuously, or flows, when subjected to shearing forces. Both liquid and gas come under the category of fluid.
Shear stresses are developed when the particles of fluid move with respect to one another. In real world shear forces are present when we consider flow past solid boundaries; aeroplanes, cars, pipe walls, river channels etc.
Some basic definitions are important to understand
1. Specific gravity or relative density is defined as the ratio of the density of a substance to the density of some standard substance at a specified temperature (usually water at 4 °C, and atmospheric pressure having a density of 1000 kg/m3). Specific gravity is a dimensionles quantity.
2. Specific weight is the weight of a unit volume of a substance. Specific weight=specific gravity X acceleration due to gravity.

Featured Links

Overhanging Beam CalculatorNew

Bending Moment & Shear Force Calculation for Overhanging beam with different loads

Fixed Beam CalculatorNew

Fixed end moment, bending moment & reaction calculation for fixed beam

Moment of Inertia calculatorNew

For different sections including I-section and T-section.

Deflection CalculatorNew

Easy to use calculator for different loads on beams

Bending Moment calculatorNew

Calculate Bending moments for simply supported beams


A collection of quiz in different areas of civil engineering

RC Beam CalculatorNew

Calculate the strength of reinforced concrete beams


3. Viscosity is a property that represents the internal resistance of a fluid to motion or the ‘fluidity’. Viscosity is due to the cohesive forces between the molecules.  Viscosity is measured in two forms; Dynamic (or absolute)  and Kinematic.
All fluids are viscous in nature. "Newtonian Fluids" obey the linear relationship given by Newton's law of viscosity. which states that shear stress is directly proprtional to velocity gradient. 
4. Surface Tension is a property of fluid that is caused by cohesion of similar molecules. It can also be termed as the contractive tendency of the surface of a fluid that allows it to resist an external force. It is because of surface tension that some objects denser than water can float on the surface of water.
In a fluid mass, each molecule is pulled equally in every direction by neighboring molecules, resulting in a net force of zero. The molecules at the surface do not have other molecules on all sides of them and therefore are pulled inwards. This phenomena develops some internal pressure and forces the liquid surfaces to contract to the minimum area.Surface tension has the dimension of force per unit length, or of energy per unit area.
Surface tension  can be defined as the energy required to stretch a unit change of a surface area. Surface tension decreases with increase in temperature.
5. Fluid Pressure is defiend as "the normal force per unit area exerted on an imaginary or real plane surface in a fluid "
Pressure is measured in Pascal (Pa) which is equal to Newton per sq m. or psi (pound per sq inch)

Do you know what is Bernoulli equation and
Continuity equation

Quiz on Hydraulics & Water Resources

Problem SolverNew

A collection of illustrated solved examples for civil engineers.

CE HorizonNew

Online Civil Engineering Journal and Magazine

Profile of Civil EngineersNew

Get to know about distinguished civil engineers

Hoover dam
Hoover dam


If you don't find the required information please tell us We are updating the website regularly.

Join the mailing list to get informed about new products or links



Applied Mechanics 

Structural Analysis 

Design of Structures

Construction Materials

Engineering Graphics


Disaster Management



Land Surveying



Environmental Engineering

Irrigation Engineering

Offshore Engineering

Construction Management 

Quantity Surveying

Construction Disputes

Construction Technology

Construction Equipments

Research Papers

Journals & Magazines

Construction Companies


Professional Societies

Computer Software 


Photo Album



Join us

Job Search

Book Store



Colleges & Universities

Higher Education

Learning Support

Last updated on Sunday June 23, 2013