## What is the correlation between viscosity and flow rate?

The resistance to flow in turn is directly proportional to the viscosity η . Thus, the flow rate is inversely proportional to the viscosity.

## Does restricting flow increases pressure?

It will take longer to fill, because your thumb has reduced the flow! The same thing would happen in your sprinkler system if you used smaller pipe to increase the pressure. The smaller pipe would restrict the flow of water. The reduced flow would reduce the pressure loss in the pipes, resulting in more pressure.

## What’s the difference between cohesion and adhesion?

Adhesion and cohesion are important water properties that affects how water works everywhere, from plant leaves to your own body. Just remember… Cohesion: Water is attracted to water, and Adhesion: Water is attracted to other substances.

## Does flow rate affect pressure?

Under laminar flow conditions, pressure drop is proportional to volumetric flow rate. At double the flow rate, there is double the pressure drop. Under turbulent flow conditions, pressure drop increases as the square of the volumetric flow rate. Pressure drop increases as gas viscosity increases.

Tap water

## Does salt water have higher surface tension?

Yes, adding salt to water does increase the surface tension of water, although not by any significant amount. However, experiments done with salt water show that surface tension actually increases when salt is added to pure water.

## What is the relationship between pressure and flow?

Fluid flow requires a pressure gradient (ΔP) between two points such that flow is directly proportional to the pressure differential. Higher pressure differences will drive greater flow rates. The pressure gradient establishes the direction of flow.

## How does temperature affect viscosity and flow rate?

The increase in temperature causes the kinetic or thermal energy to increase and the molecules become more mobile. The attractive binding energy is reduced and therefore the viscosity is reduced.

## Is flow rate directly proportional to pressure?

Flow rate Q is directly proportional to the pressure difference P2−P1, and inversely proportional to the length l of the tube and viscosity η of the fluid. Flow rate increases with r4, the fourth power of the radius.

## Does water or salt water have more cohesion?

The salt water has a much lower cohesion than plain water so it’s attractive forces are less than plain water. The surface tension does increase when the salt is added to the water so that means that the penny drop experiment is mostly affected by the water’s cohesive forces.