Properties of matter, Civil Engineering

Properties of Matter:

  • Due to surface tension, the free surface of a liquid behaves like a stretched elastic membrane tending to contract so as to have minimum surface area. It is measured as the force per unit length perpendicular to an imaginary line on the liquid surface.
  • Pressure is defined as the ratio of the force to the area on which it acts. That is : P = F /A

The fluid pressure at a point within a fluid is given as :

P = h ρ g

  • According to the Pascal's law, pressure applied at any point on the surface of a given mass of an enclosed liquid at rest is transmitted over the whole liquid.
  • Archimedes' principle states in which there is an apparent loss in the weight of a body immersed in a liquid (or gas) and this loss of weight is equal to the weight of the liquid (or gas) displaced by it.
  • An ideal fluid is incompressible and its flow is laminar, non-viscous and irrotational. A flow of liquid is of two types. Those are given below:

(i) Streamline motion, and

(ii) Turbulent motion.

  • An equation of continuity is a consequence of the principle of conservation of mass of liquid and for streamline flow of a liquid is

a1 v1 = a2 v2

where a1 and a2 are the areas of two different cross-sections of a tube of flow and v1 and v2 respectively are the velocities of flow through these sections.

  • The Bernoulli's equation is an expression representing the principle of conservation of energy for liquids. It is expressed as:

P/ ρ + gh + v2/2= constant

  • The property by virtue of which a liquid opposes relative motion between its different layers is called viscosity. It is similar to the frictional force experienced by solids in motion.
  • The property of matter to regain its natural shape and size or to oppose any attempt to deform it is called elasticity.
  • The internal restoring force, arising due to an external deforming force applied on a body, and acting per unit area of cross-section of the body is called stress. The stress may be longitudinal, compressional and shearing.
  • Strain is defined as the change in dimension of a body per unit dimension.

Strains are of three types, namely

(i) Linear strain,

(ii) Volume strain, and

(iii) Shearing strain.

  • Hooke's law states that, within elastic limit, the stress is directly proportional to the corresponding strain.

 

Posted Date: 1/23/2013 6:15:54 AM | Location : United States







Related Discussions:- Properties of matter, Assignment Help, Ask Question on Properties of matter, Get Answer, Expert's Help, Properties of matter Discussions

Write discussion on Properties of matter
Your posts are moderated
Related Questions

Q. Diffrence between Concrete road and bituminous road? Concrete road belongs to rigid pavement and they don't deflect under traffic loads. Quite the reverse, bituminous pavem


Question In conditions of pumping performance, how have to engineers determined use of radial flow pumps and axial flow pumps ? Answer Exact speed is usually define

What is the meaning of Wrapped splices In the Wrapped splices, tendon wires are wrapped with small diameter high-tension wires along their lengths with the help of  wire windin

Breakwater and its types

Define Inspection of Pier or Abutment? Inspection of pier/abutment may then be carried out as under: i. Conduct visual inspection of the entire surface using up and down swe


Q. Direction of placing the main weight of reinforcement in concrete pavement? The reinforcement of concrete pavement is typically in the form of longmesh type. A road generall

What is the difference between shear and tensile strength? Ans) Tensile Strength for a Bolt is explained by applying a Force along it long axis. Shear Strength for a Bolt is exp