The scientific fluid definition is very simple to understand. Fluid meaning refers to a substance that does not have a definite shape and yields easily to external pressure. It can be a liquid or a gas. We say that a fluid can flow easily and we find its applications more in clutch or coupling, where fluid helps transmit the power supply.
In the above text, we got a brief of what is fluid and now, we will dig into the scientific definition of fluid. Now, let’s see what is fluid with some fluid information and facts about fluid science.
Fluid Examples in Everyday Life
You might have heard of the word ‘Fluid’, now, we will look at some examples of everyday use of this term to understand it better.
The patient is severely dehydrated, and he needs fluids urgently.
The tanks on the rooftop are placed for storing fluids like oil, kerosene, and gas.
We generally keep our household cleaning fluids out of the reach of the children.
Our stomach collects gastric fluids around its edge to digest food.
We saw some kind of fluid oozing (a viscous liquid) coming out from the trunk of the tree.
Fluid Definition Physics
In Physics, the fluid definition is:
A fluid is a substance that continually flows or deforms when we subject it to shear stress or external force.
The fluid is one of the phases of matter and we consider fluids like liquids, gases, and plasmas. One of the scientific definitions of fluid is that these are substances with zero shear modulus, or, in simpler words, these substances cannot resist the shear force applied to them.
Fluid Information Definition
To understand fluid information definition, let’s consider the below one-line statements:
The term ‘fluid’ is more closely related to being a solid plasma; however, we consider it as liquid and gas. A fluid carries no shear modulus. Now, let’s types of fluid flow:
Fluid flow has is of the following types:
Steady or unsteady
Compressible or incompressible
Viscous or non-viscous, and
Rotational or irrotational.
Steady or Unsteady Flow
The flow of fluid can either be steady or unsteady, depending on the velocity of the fluid:
Steady: In steady fluid flow, the fluid’s density remains constant at every point.
Unsteady: During the unsteady flow, the fluid’s velocity differs between any two points.
Viscous or Non-Viscous Flow
Liquid flow can be viscous or non-viscous.
Viscosity is a measure of the thickness of a fluid, and very sticky fluids viz: motor oil or shampoo are called viscous fluids.
We see ‘fluid definition’ a lot many times; however, ‘fluid’ is used in everyday life and is understood with some of its characteristics.
Now, let’s look at some characteristics of a fluid:
Capable of flowing and easily changing its shape.
Constantly changing or apt to variations.
Smooth in movement, i.e., easy flow.
Types of Fluids
The below diagram shows the types of fluids.
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Now, let’s look at types of fluid.
The Types of Fluids are:
1. Ideal Fluid
An ideal fluid is incompressible and it is an imaginary fluid that doesn’t exist in reality. Also, it doesn’t have viscosity.
2. Ideal plastic Fluid
When the shear stress becomes proportional to the velocity gradient and more than the yield value, the fluid is said to be the ideal plastic fluid.
3. Real Fluid
Fluids having viscosity are real fluids.
4. Newtonian Fluid
A fluid obeying Newton’s law of viscosity is known as a Newtonian fluid.
5. Non-Newtonian Fluid
A fluid not obeying Newton’s law of viscosity is said to be a Non-Newtonian fluid.
6. Incompressible Fluid
When the density of the fluid remains invariant with the application of external force, it is said to be incompressible fluid.
7. Compressible Fluid
When the density of the fluid varies with the application of external force, it is a compressible fluid.
Interesting Facts About Fluids
A very common fact about fluids is that they have a constant volume, meaning that they confine within the vessel they are kept in.
Now, let’s look at a few more interesting facts about fluids.
After cooling liquids, we can compress them, except for ice, which expands.
We cannot compress water.
Liquids have three forms.
The liquid form of fluid is a prerequisite of carbon-based life
Most of the water present on the earth is from outer space.
Cats release a lot of fluid in the saliva.
Fluid mechanics is the study of the forces on the fluid and how fluids move. Fluid mechanics can be divided into parts: fluid statics and fluid dynamics. Fluid statics is the study of fluids at rest, and fluid dynamics is the study of fluids in motion.
Fluid mechanics is a branch of continuum mechanics, a subject that models matter without using the information of what atoms they are made of.