# What is the resistance of a fluid to flow?

One is more viscous than the other is. Viscosity is a term used to describe resistance to flow at a particular temperature. A liquid with a high internal resistance to flow is described as having a high viscosity (such as honey at room temperature).

What is the definition of water resistance?

Water Resistant is a common mark stamped on the back of wrist watches to indicate how well a watch is sealed against the ingress of water. It is usually accompanied by an indication of the static test pressure that a sample of newly manufactured watches were exposed to in a leakage test.

Why is air considered to be a fluid?

Any substance that flows is considered a fluid. This includes such things as water, shampoo, sunscreen, and even honey. Although not necessarily obvious, even gases, such as air, can be classified as fluids. This activity will allow students to ‘pour’ a gas and watch the results.

## What is the Poiseuille’s law?

medical Definition of Poiseuille’s law. : a statement in physics: the velocity of the steady flow of a fluid through a narrow tube (as a blood vessel or a catheter) varies directly as the pressure and the fourth power of the radius of the tube and inversely as the length of the tube and the coefficient of viscosity.

## What is the term that means a resistance to flow?

Viscosity is a measure of a fluid’s resistance to flow. It describes the internal friction of a moving fluid. A fluidwith large viscosity resists motion because its molecular makeup gives it a lot of internal friction.

## What determines resistance to blood flow?

There are three primary factors that determine the resistance to blood flow within a single vessel: vessel diameter (or radius), vessel length, and viscosity of the blood.

## Which state of matter undergoes changes in volume most easily?

Answer: The gaseous state of matter undergoes changes in volume most easily.

## What happens to a puddle after a rainstorm?

Explain why a truck tire that has the correct air pressure inside a building at room temperature is more likely to explode when driven in hot weather than in cold weather. The puddle evaporates into the air around us. Explain what happens as a puddle dries after a rainstorm.

## What is the Hagen Poiseuille equation?

In nonideal fluid dynamics, the Hagen–Poiseuille equation, also known as the Hagen–Poiseuille law, Poiseuille law or Poiseuille equation, is a physical law that gives the pressure drop in an incompressible and Newtonian fluid in laminar flow flowing through a long cylindrical pipe of constant cross section.

## When an inflated balloon is exposed to cold air what happens to the volume?

Solids, Liquids, and Gases ReviewQuestionAnswerWhat happens to the volume of an inflated balloon when it is exposed to cold air?DECREASESWhat does a graph that shows the pressure of a gas varies inversely with its volume under constant temperature demonstrate?BOYLE’S LAW

## What are two factors that affect viscosity?

Fluid viscosity changes with temperature. Pressure has a small impact on gas viscosity and the pressure impact on the viscosity of a liquid is very small. When studying multiphase liquids (a mixture of gas, liquid and solids) there are other factors that come into play.

## What is the difference between the two types of vaporization?

Vaporization of a sample of liquid is a phase transition from the liquid phase to the gas phase. There are two types of vaporization: evaporation and boiling. Evaporation occurs at temperatures below the boiling point, and occurs on the liquid’s surface.

## What is it called when a substance changes directly from a solid to a gas?

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. The reverse process of sublimation is deposition, in which a substance passes directly from a gas to a solid phase.

## What is laminar flow used for?

A laminar flow cabinet or laminar flow closet or tissue culture hood is a carefully enclosed bench designed to prevent contamination of semiconductor wafers, biological samples, or any particle sensitive materials. Air is drawn through a HEPA filter and blown in a very smooth, laminar flow towards the user.

## What is the opposite of vaporization?

The opposite of this process is called deposition : the transition from the gas to the solid. Condensation is the transition from gas to liquid as in the condensation of steam to liquid water. Vaporization is the opposite from the liquid to the gas state.

## What is needed to cause a change in the state of matter?

Adding energy to matter causes a physical change — matter moves from one state to another. For example, adding thermal energy — heat — to liquid water causes it to become steam or vapor — a gas. Taking away energy also causes physical change, such as when liquid water becomes ice — a solid — when heat is removed.

## How does a laminar flow hood work?

The process of laminar air flow can be described as airflow where an entire body of air flows with steady, uniform velocity. Laminar Flow Cabinets work by the use of in-flow laminar air drawn through one or more HEPA filters, designed to create a particle-free working environment and provide product protection.

## What causes a turbulent flow?

In fluid dynamics, turbulence or turbulent flow is any pattern of fluid motion characterized by chaotic changes in pressure and flow velocity. Turbulence is caused by excessive kinetic energy in parts of a fluid flow, which overcomes the damping effect of the fluid’s viscosity.

## What is vaporization that takes place only at the surface of a liquid?

The change in state from a solid to a liquid is called melting. Vaporization that takes place only on the surface of a liquid is called evaporation. Boiling- Another kind of vaporization is called boiling. Boiling occurs when a liquid changes to a gas below its surface as well as at the surface.

## What is the definition of laminar flow?

In fluid dynamics, laminar flow (or streamline flow) occurs when a fluid flows in parallel layers, with no disruption between the layers. At low velocities, the fluid tends to flow without lateral mixing, and adjacent layers slide past one another like playing cards.

## What happens to the viscosity of a liquid as the temperature increases?

With an increase in temperature, there is typically an increase in the molecular interchange as molecules move faster in higher temperatures. The gas viscosity will increase with temperature. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.

## What happens to the water molecules in an ice cube when it’s removed from the freezer?

Inside the freezer, the ice cube is at a temperature below 0°C. When it is removed from the freezer, the ice cube absorbs thermal energy from its surroundings, mostly from the air in the room. At first, the added thermal energy causes the water molecules to vibrate faster, raising their temperature.

## Is the driving force that causes matter to change phase?

The driving force that causes matter to change phases is ? Evaporation is when heat is added to a liquid and it changes to gas because the particles move faster and further apart.

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