Mix And Flow Of Matter

Question 1

What does buoyancy mean

Answer 1

Tendency of an object to float when placed in a fluid

Question 2

Define compressibility

Answer 2

Extent to which a substance (solid liquid or gas) can be compressed

Question 3

What does incompressible mean

Answer 3

Not capable of being compressed

Question 4

Define pressure

Answer 4

Measure of the amount of force applied to a given area

Question 5

Define pascals law

Answer 5

When pressure is applied to a liquid in a container the pressure and force is transmitted equally and undiminished throughout the liquid; an enclosed liquid transmits pressure equally in all directions

Question 6

Define hydraulic system

Answer 6

System that uses the liquid under pressure to move loads

Question 7

Define pneumatic system

Answer 7

System that uses a gas under pressure to move loads

Question 8

What happens to the viscosity of a fluid when there is an increase or decrease in the temperature?

Answer 8

As the temperature of the liquid decreases its viscosity increases and as The temperature increases the viscosity decreases

Question 9

What are the steps to calculate density

Ex: what is the density of the following substance
2.0 mL of mercury has a mass of 27.1 g

Answer 9

D=?
M=27.1 g
Volume=2.0 ml

D= M/V

D= 27.1g/2.0 ml

13.55

The density of mercury is 13.55

Question 10

What happens to the density of a fluid when there is an increase or decrease in the temperature?

Answer 10

And low temperatures it will be a solid and at higher temperatures it will be a liquid and at even higher temperatures it will be a gas

Question 11

How does density change when the concentration of a substance is increase or decreased?

Answer 11

Increasing the concentration of a substance in the solution increases the density

Question 12

Give an example where we was buoyancy

Answer 12

On A boat The boat pushes the water down there for the water will want to come back up and pushes the boat back up

Question 13

How are the compressibilities of liquids and gases different

Answer 13

since the particles in a liquid are more closer together it is harder to compress it and since air particles are further apart it is more compressible

Question 14

Explain pressure in your own words

Answer 14

Pressure is the amount of force applied to a given area

Question 15

What is an every day material that has a fluid under pressure

Answer 15

A hose uses water under pressure

Jack hammer uses air under pressure

Question 16

What does SCUBA

stand for?

Answer 16

Self contained underwater breathing apparatus

Question 17

What causes the “bends” and how is it treated

Answer 17

Bends are when The sudden change in pressure causes nitrogen gas to bubble out of the blood and tissues these bubbles can collect in other body parts and cause considerable pain. The treatment for the Bends is to place that affected Diver in a special chamber this chamber increases the pressure surrounding the divers body

Question 18

What are pumps used for? provide an example.

Answer 18

Pumps are devices that move a fluid Through or into something they are used too put air into something so that it will stay. Ex: when you want to filter your water in your aquarium you pump air into it to clean it

Question 19

How does a detergent work to make clothes clean?

Answer 19

When dirty and grease are on the fabric and you put it in the washing machine the mixture of water detergent and clothes is Agitated in the washing machine then dirt breaks off from the clothes and surfactants in the detergents surround the dirt particles so they can’t reattached to the clothes

Question 20

Define surfactant

Answer 20

Particles that attach themselves to dirt and oil particles, separating them from fabric or other materials

Question 21

What are valves used for? provide an example.

Answer 21

They are used to control or regulate the amount of flow..

Ex: the valves in your bathroom taps

Question 22

What is a Bathyscaph? How is it different from submarine?

Answer 22

A Bathyscaph is a different kind of submersible it is designed to go to the very deep parts of the ocean.
It is different because then some marine because a bathyscaphe can go very deep unlike a submarine that has a limitation

Question 23

How is a fish similar to a submarine and how would dives and surfaces?

Answer 23

Because one of fish wants to dive it uses its swim bladder and dissolved gases in the fishes blood moving to the sack to give it buoyancy and when it wants to dive deeper the swimbladder Empties.

Question 24

Describe how a submarine uses water and compressed air to be able to sink and surface in the ocean

Answer 24

When a submarine is on the surface it’s ballast tanks are full of air which makes it rise when it want to dive the submarine releases air from the ballast tanks to the valves on the top of the tanks and bring some water through the bottom valves and when it wants to resurface compressed air is forced into the ballast tanks do the valves at the top and this forces the sea water out of the bottom valves.

Question 25

What does buoyant force mean

Answer 25

Upward force that a fluid exerts on an object