What are Fluids in Physics? | Definition, Examples, Properties, Types – Hydrostatics

Fluids Definition Physics:
1. Fluid, any liquid or gas or generally any material that cannot sustain a tangential, or shearing, force when at rest and that undergoes a continuous change in shape when subjected to such a stress.

2. Fluids are those substances which can flow when an external force is applied on them.

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What are Fluids in Physics? | Definition, Examples, Properties, Types – Hydrostatics

Liquids and gases are fluids. The key property of fluids is that they offer very little resistance to shear stress. Hence, fluids do not have finite shap but takes the shape of the containing vessel.

Fluid Properties:
In fluid mechanics, the following properties of fluid would be considered

  • When the fluid is at rest- hydrostatics
  • When the fluid is in motion — hydrodynamics

Types of Fluids in Physics:

  • Ideal fluid.
  • Real fluid.
  • Newtonian fluid.
  • Non-Newtonian fluid.
  • Ideal plastic fluid.

Examples of Fluids in Physics:

  1. A river flowing down a mountain
  2. Air passing over a bird’s wing
  3. Blood moving through a circulatory system
  4. Fuel moving through an engine

Hydrostatics is a property of liquid or fluid in mechanics. A fluid is a material which flows at room temperature, because its upper molecule overlaps the inner molecule, which tends to flow the liquid in forward direction. In hydrostatics, we will learn about the condition of fluids when it is in rest or exerted by an external force. Here we will study the fluids in motion.

Properties of Fluids Thrust
Pressure Pressure Exerted by Liquid
Buoyant Force Pascal’s Law
Archimedes’ Principle Law of Floatation
Density Relative Density
Density of a Mixture