Water Properties- 7 Most Important Terms in Hydraulics Engineering

There are seven water properties you have to study as an engineering student.

Hydraulics engineering is the branch where you will get all the details about water and its types of machinery.

Hydraulic Machines defined as that Branch of Engineering, which deals with the Machine run by water under some head or raising to some higher level.

Before starting the study of hydraulic machines you have to know about the properties of water. Hence you will get all details here.

water properties

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So, Below are The Properties of Water at rest and motion

01) Keep its surface level, at rest
02) It exerts a uniform pressure in all direction.
03) The velocity, in a channel, is more at the centre than at the sides.
04) A velocity of water is directly proportional to the slope of the channel bed.
05) The pressure is equal to its weight and thus, the pressure increases with the depth.

Properties of Liquid

  • Density of Water

So, the mass per unit Volume at a standard Temperature and Pressure is known as Density of Liquid.

It is denoted by “rho”. 

  • Specific Weight

So, The Weight per unit Volume, at Standard Temperature and Pressure, is known as Specific Weight of Liquid. Denoted by “w” 

  • Specific Gravity

It is the ratio of its Specific Weight to that of a  Standard Temperature.

  • Compressibility

The variation in its Volume, with the variation in its Pressure, is known as Compressibility of Water.

Hence the Water is considered to be an incompressible liquid. 

  • Surface Tension

It is the property, which enables it to resist Tensile Stress. It is due to Cohesion between the Molecules at the surface of a liquid.

Drops of rain sphere because the liquid surface has a tendency to reduce its surface as small as possible.

  • Capillarity of Water

So, The Phenomenon of rising Water in the tube of smaller diameter is called the Capillary rise.

  • Viscosity 

The property of Liquid which controls its rate of flow is known as “Viscosity of Water”.

Many times, we Engineers get confused in between mass & weight. Hence I will try to make it simple,

So, What is the difference between Mass and Weight?

  • MASS

So, it is the amount of matter contained in a given body and does not vary with the change in its position on the Earth’s surface. 


It is the amount of pull, which the Earth exerts upon a given body; therefore the Weight of the body will vary with its position on the earth’s surface.

Besides this information, you are suggested to read something more from below engineering books

So, Here you find Best Engineering Resources for further details

It is a glimpse hence I recommend reading  books

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