![]() $$\mathrm$ will affect both density and viscosity and also affects the flow properties of the fluid. ![]() ![]() Mathematically viscosity is defined by this formula : When a liquid or gas has a high viscosity it flows with difficulty due to its internal friction caused by its sticky, thick, and semi-fluid consistency nature. When a liquid or gas has a low viscosity it tends to flow more easily as its molecular interaction causes very little friction when moving. The viscosity is the opposite or reciprocal of fluidity. It is a quantity of the opposition or resistance of a fluid to move under an applied force. Therefore, the water has more fluidity, less resistance to flow and lower viscosity, whereas honey has less fluidity, more resistance to flow and higher viscosity. Here, in the above cases, water has less force of attraction as compared to honey particles. In technical terms, viscosity is the amount or quantity of opposition or resistance to flow provided by a liquid when it is under an applied force. The standard SI unit of viscosity is Newton-second per square meter ( N s / m 2 ), which is usually shortened to Pa-second ( Pa s ), that is because 1 Pa is equal to 1 N / m 2. For example, honey is thicker than water so it will take more time to flow as compared to water as it has less resistance to flow. In simple words, viscosity is related to the thickness of the liquid. It is the property of a liquid by which an internal force comes into play between different layers whenever there is a relative motion between these layers of the liquid. Such liquid behaviour in the flow possesses some internal property which is explained by the term viscosity. We all might have noticed that it takes a long time for the honey to reach the mouth of the bottle when the honey bottle is about to empty.
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