Roymech engineering encyclopedia

Fluids Mechanics Index

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Fluids Mechanics Index

Pump Notes and Calculations Pumps ........ Valve Notes Valves ........ Fluid Power Notes Fluid Power


A fluid is a substance which cannot preserve its own shape..
A fluid is a material substance which cannot sustain a shearing stress when it is at rest.

A fluid can be either a liquid or a gas.   A liquid retains a set volume and has a surface of separation above which is a vapour and below which is a liquid.   A gas, whatever its quantity, when placed in an empty closed vessel will fill the vessel completely.  It is important to note that a gas is generally considered to be an compressible fluid and a liquid is generally considered to be incompressible.  In practice a liquid is compressible but generally very large pressures are required to cause quite small changes of volume.

Fluid Properties Fluid Flow Pipe Flow Hydrostatics Gas Flow
Fluid Jets Dimensional Analysis Channel Flow Drag Curved Motion
Fluid Props of Water Fluid Viscosities Orifice Plates Etc Fluid machines;  

Useful Links
  1. Wikipedia Mechanics of Fluids .. Excellent source of information
  2. Fluid Mechanics.. Course Notes from U of Leeds - Very very useful.(Not supported)
  3. 1MNO eng.. A site containing a large number of Fluid Flow Calculations and Calculators :Calculators now require registration for a fee;
  4. Engineering Page.. A site including various Engineering Calculators - Very good pump calculator
  5. Spirax Sarco...Excellent Reference Site . Learning centre includes fluid flow reference information