# Water – Density, Viscosity, Specific Weight, specific heat [PDF]

Contents

## What is Density?

Density is a fundamental characteristic of matter easily understood by water, described by the compactness of particles within a given spatial extent. Mathematically, density is ascertained by dividing the mass of the entity by its corresponding volume.

Formula for Density

Density = Mass / Volume

Mass is typically measured in kilograms (kg) or grams (gm), while volume is gauged in cubic meters (m³) or cubic centimeters (cm³).

The unit of measurement for density relies on the chosen metrics for mass and volume. For instance, if mass is expressed in grams and volume in cubic centimeters, density is denoted in grams per cubic centimeter (g/cm³). Similarly, if mass is specified in kilograms and volume in cubic meters, density assumes the form of kilograms per cubic meter (kg/m³).

## What is Dynamic Viscosity?

Dynamic viscosity describes how “thick” or resistant a fluid is to flow when a force is applied to it. It determines the rate at which adjacent layers of the fluid move past each other.

The dynamic viscosity of water is 8.90 x 10-4 Pa.s or 8.90 x 10-3 dyn.s/cm2 or 0.890cP at about 25°C.

The water viscosity is 0.0091 pose at 25°C or 1 centipoise at 20°C.

## FAQ’s

### What are the properties of water?

There are several properties of water. To make it easier to understand I have compiled it in to a table here.

### What is the dynamic viscosity of water?

The dynamic viscosity of water is 0.001002 Pa·s at 20°C. The viscosity of water is temperature dependent. This means that it changes with varying temperatures. The dynamic viscosity decreases as the temperature of water increases and vice versa.

### What is the mu of water?

Mu is nothing but the symbol to represent the dynamic viscosity. It is written as ‘μ’. For water at 20°C, the dynamic viscosity (μ) is approximately 0.001002 Pascal-seconds (Pa·s). You must note that the dynamic viscosity of water varies with temperature. So this value is specific to the given temperature.

### What is the viscosity of water at 25°C?

The dynamic viscosity of water at 25°C is approximately 0.000890 Pascal-seconds (Pa·s). You must note that the viscosity of water is influenced by temperature.

### What is the kinematic viscosity of water in m2/s?

The kinematic viscosity of water at 25°C is 0.000001005 m²/s. Mathematically kinematic viscosity is found by dividing the dynamic viscosity by density of a fluid.

## Conclusion

Hence, in exploring the fascinating properties of water, it becomes evident that its density plays a crucial role. The density of water, influenced by the arrangement and bonding of its molecules, allows us to understand how it behaves under different circumstances. This understanding of water density is not only significant in scientific research but also has practical implications in various fields. By learning about properties of water, we can gain insights into its buoyancy. Also, we can understand its impact on natural phenomena. Water’s density serves as a fundamental characteristic that helps us comprehend its unique behavior and contributions to the world around us.

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