Water Viscosity Calculator

An online water viscosity calculator allows you to find the viscosity, density, dynamic, and kinematic density of water at any temperature. You can get the kinematic viscosity and dynamic viscosity of water by a chart that is provided by the viscosity calculator. Furthermore, you will learn how to find the viscosity of water and the temperature that effects the viscosity of water at room temperature.

What is the Viscosity of Water?

In physics, the viscosity of water is defined as the resistance of water to flow. In other words, viscosity is a physical property of a fluid that indicates the “thickness” or internal friction of a liquid like water. At the molecular level, it arises from interactions between water molecules. Generally, viscosity is measured in Newton-seconds per meter squared or Pascal-seconds (Pa·s). Remember that the viscosity of water is inversely proportional to temperature: as temperature increases, viscosity decreases; conversely, when temperature decreases, viscosity increases. Water is often used as a reference for other liquids, as each fluid has characteristic values of viscosity and density, which are typically low or high depending on the liquid.

Viscosity Formula:

The viscosity of water can be determined using the following formula:

η = \frac {2ga^2 (∆ρ)} {v}

Where,

η = viscosity of water

v = velocity of the sphere

g = acceleration due to gravity

a = radius of the sphere

An online Density Calculator can also be used to determine the density of an element, which is its mass per unit volume.

Example:

Find the viscosity of water at 20 °C.

Solution:

The dynamic viscosity calculator provides the following values for water at 20 °C:

Dynamic viscosity = η = 1.0016 mPa·s

Kinematic viscosity = ν = 1.0034 mm²/s

Density = 0.9982 g/cm³

The Viscosity of Water at Different Temperatures:

Temperature [°C]	Viscosity [mPa·s]
10	1.308
20	1.002
30	0.7978
40	0.6531
50	0.5471
60	0.4658
70	0.4044
80	0.3550
90	0.3150
100	0.2822

Kinematic and Dynamic Viscosity of Water in SI Units:

Temperature - t - (°C)	Dynamic Viscosity - µ - (N s/m2) x 10-3	Kinematic Viscosity -ν - (m2/s) x 10-6
0	1.787	1.787
5	1.519	1.519
10	1.307	1.307
20	1.002	1.004
30	0.798	0.801
40	0.653	0.658
50	0.547	0.553
60	0.467	0.475
70	0.404	0.413
80	0.355	0.365
90	0.315	0.326
100	0.282	0.294

Why should I Measure the Viscosity?

Calculating the viscosity of materials helps manufacturers predict how these substances will behave in real-world applications. For example, if toothpaste does not have the correct viscosity, it may be difficult to dispense from the tube. Knowing the exact viscosity of a material allows you to design transportation, production, and processing systems more accurately.

An online Specific Heat Calculator also helps determine the heat energy, specific heat, mass of a substance, and its initial and final temperatures.

Types of Viscosity:

Viscosity represents the internal friction between molecules in a fluid in motion. There are two main types of viscosity measurement:

Kinematic Viscosity
Dynamic Viscosity

Kinematic Viscosity:

Kinematic viscosity measures a fluid's internal resistance to flow under the influence of gravity. A kinematic viscosity calculator determines this by measuring the time (in seconds) it takes for a fixed volume of liquid to flow through a capillary tube over a known distance at a specific temperature.

Dynamic Viscosity:

Dynamic viscosity is the tangential force per unit area required to move a fluid in the horizontal plane. It is also referred to as absolute viscosity and represents the fluid's resistance to shear.

Different Techniques and Tools to Measure Viscosity:

Viscosity measurements were first performed in the 1800s using capillary tube methods. Today, various instruments and techniques are used to measure viscosity accurately:

Capillary Viscometer
Zahn Cup
Falling Sphere Viscometer
Vibrational Viscometer
Rotational Viscometer

What is the Weight and Density of Water at Known Temperature?

Temperature	Density	Weight
°F	grams/cm3	pounds/ft3	kilograms/liter
32°	0.99987	62.416	0.999808
39.2°	1.00000	62.424	0.999937
40°	0.99999	62.423	0.999921
50°	0.99975	62.408	0.999681
60°	0.99907	62.366	0.999007
70°	0.99802	62.300	0.997950
80°	0.99669	62.217	0.996621
90°	0.99510	62.118	0.995035
100°	0.99318	61.998	0.993112

Newton’s Law of Viscosity:

According to Newton’s law of viscosity, the shear stress between adjacent layers of a fluid is directly proportional to the velocity gradient between those layers.

Newton’s Law of Viscosity = τ = η du / dy

Where,

η = Viscosity

τ = Shear Stress

du / dy = Rate of Shear Deformation

Newtonian Fluid:

A liquid whose viscosity does not change with shear strain (du/dy) is called a Newtonian fluid. Fluids that follow Newton’s law of viscosity are Newtonian fluids.

Non-Newtonian Fluid:

A liquid whose viscosity changes with shear strain (du/dy) is called a Non-Newtonian fluid. Fluids that do not follow Newton’s law of viscosity are Non-Newtonian fluids.

How to Use Water Viscosity Calculator?

An online viscosity calculator can compute the thickness of water at any temperature, even above 300°C, by following these steps:

Input:

Enter the temperature of water.
Select the temperature unit for determining the viscosity.
Click the “Calculate Viscosity” button.

Output:

The calculator provides the density, dynamic viscosity, and kinematic viscosity of water at the given temperature, along with a water viscosity vs. temperature chart.

FAQs:

Is viscosity directly proportional to density?

There is no direct relationship between density and viscosity. However, both are influenced by the temperature of the liquid.

What is the thinnest fluid in the world?

Graphene is one of the thinnest fluids. It conducts electricity efficiently and interacts with water in unique ways.

Is viscosity dependent on pressure?

Viscosity is generally independent of pressure, but liquids under extreme pressure often experience an increase in viscosity.

Is water basic or acidic?

Water is neither basic nor acidic. It has a pH of 7, making it a neutral substance.

What is the viscosity of water at 25 Celsius?

The viscosity of water at 25°C is roughly \(10^{-3}\) Pascal Second or 0.01 Poise.

What is the kinematic viscosity of water at 22°C?

The kinematic viscosity of water (ν) at 22°C is 0.9565 millimeter squared per second (mm²/s).

What are the three states of water?

At 100°C, water reaches its boiling point and converts into the gaseous state.
Water freezes at 0°C, forming the solid state (ice).
Between 0°C and 100°C, water remains in the liquid state.

Why is water a universal solvent?

Water is called the universal solvent because it can dissolve many substances, including sugar, salt, gases, acids, and bases.

Conclusion:

Use this water viscosity calculator to determine the viscosity and density of water at a given temperature. You can also refer to the water viscosity vs. temperature chart or table to see how temperature affects water viscosity.

Reference:

From the source of Wikipedia: Viscosity, Kinematic viscosity, Momentum transport, Newtonian and non-Newtonian fluids, Molecular origins, Chapman–Enskog theory.

From the source of Physics Info: Factors affecting viscosity, motor oil, low-temperature specifications, high-temperature specifications, capillary viscometer, falling sphere.

From the source of Science Direct: Dynamic viscosity, Oil characteristics, Kinematic viscosity, viscous force, inertial force, dynamic viscosity for liquid fuels, kinematic viscosity for gas turbine liquid fuels.