Mechanical Properties of Fluids Test - 5

According to bernoulli principle for fluids: in ideal state pressure and density are inversely related or in other words a slow moving fluid exerts more pressure than a fast moving fluid. Due to narrowness and other obstruction the velocity of the flow of blood gets decreased in old age. This results in increased pressure inside the blood vessel.

Water molecules have a tendency to stick together, as opposed to losing their fellow water molecules’ company and sticking to other surfaces. This happens as a result of something known as the ‘surface tension’ of water.

Surfactants are substances that help lower the surface tension of water molecules, thus ‘persuading’ them to wet things more uniformly.

Soaps (which are a type of detergent) contain surfactants in significant amounts, which help water spread uniformly over clothes.

As liquids have property of surface tension due to which if we decrease the surface(i.e;diameter or radius)of capillary tube the liquid inside it increases. In thin tubes the surface is narrow that is why the liquid increases its level.

Charge will be distributed uniformly on the surface of a bubble if the bubble is charged.The bubble will expand because the charged particles uniformly distributed on it cause them to repel each other due to the electrostatic force. This will happen to both positive and negatively charged bubbles because of the charge on it.

when any liquid is poured onto another liquid there are different phenomena that can take place depending on the properties of liquids:In case of crude oil and water -

The two liquids are non-miscible and the first is lighter than the second. The first liquid then spreads on the surface of the second liquid forming a thin layer. The thickness of this layer depends on the properties of the two liquids. This is the case for most hydrocarbons, including both refined products and crude oil of API gravity greater than 10.

In small drops effect of gravity can be ignored because all the points can be considered at same height. Thus to acquire minimum energy they will acquire spherical shape while in larger drops due to finite radius of drop all the points cannot be assumed at same height thus drop will try to acquire spherical shape but due to effect of gravity its shape will be a little distorted from the pure spherical shape.