Viscosity of Water at 30°C

Viscosity is a measure of a fluid's resistance to flow. It determines how easily a fluid can be poured or how it flows through a pipe. Water is a commonly used fluid, and its viscosity varies with temperature.

Viscosity of Water
Water is a Newtonian fluid, which means its viscosity remains constant with temperature and pressure changes. However, its viscosity decreases as the temperature increases. Therefore, at different temperatures, water will have different viscosities.

Temperature and Viscosity Relationship
The relationship between temperature and viscosity can be described by the Arrhenius equation, which states that the viscosity of a fluid decreases exponentially with increasing temperature. In simpler terms, as the temperature increases, the viscosity decreases.

Viscosity of Water at 30°C
To determine the viscosity of water at 30°C, we can refer to experimental data or use mathematical models to estimate the value. According to experimental data, the viscosity of water at 30°C is approximately 0.801 cP (centipoise).

Options Explanation
a) 80.1: This option is incorrect as it is ten times larger than the expected value.
b) 0.801: This option is correct, as it matches the viscosity of water at 30°C.
c) 801: This option is incorrect, as it is one thousand times larger than the expected value.
d) 0.081: This option is incorrect, as it is ten times smaller than the expected value.

Conclusion
The correct answer is option 'B' (0.801), as it represents the viscosity of water at 30°C accurately. Understanding the relationship between temperature and viscosity is crucial in various fields, including civil engineering, where it influences the design and analysis of fluid flows in pipes, channels, and hydraulic systems.