PRELIM

Question 1

are substances capable of flowing, heaving particles which easily move and change their relative position without separation of mass.

Answer 1

Fluids

Question 2

Fluids readily conform to the shape of the _____ _____ with which they come into contact

Answer 2

solid body

Question 3

Fluids may be divided into ______ and ______

Answer 3

liquids and gases

Question 4

Liquids have free surface while gas does not.
What is a free surface

Answer 4

It is a surface or the uppermost part of a liquid in contact with earth’s atmosphere (air).

Question 5

Mass of liquid and gas in connection to volume

Answer 5

liquid occupies only given volume while gas occupies all portions of any container regardless of its size

Question 6

Liquids are practically incompressible while gases are compressible, what does it mean

Answer 6

incompressible means it does not expand, does volume is constant.

Question 7

what happens to gas and liquid in a closed container

Answer 7

to ensure equilibrium, liquid produces vapor in a closed container

gas, on the other hand, produces more pressure in closed container if increases

Question 8

Mass Density (ρ) formula

Answer 8

ρ = m / v

kg/m³

Question 9

ρ

Answer 9

rho
Mass Density

Question 10

mass per unit volume

Answer 10

mass density

Question 11

the gravitational force per unit volume of fluid.

The weight of a unit volume of a fluid

Answer 11

Unit Weight or Specific Weight (γ)

Question 12

γ

Answer 12

gamma
Unit Weight or Specific Weight

Question 13

Unit Weight or Specific Weight (γ) formula

Answer 13

γ = w / v
γ = ρg

N/m³ or kN/m³

Question 14

is the volume occupied by a unit mass of fluid

Answer 14

Specific Volume

Question 15

Vs

Answer 15

Specific Volume

Question 16

Specific Volume (Vs) formula

Answer 16

Vs = 1/ρ

m³ / kg

Question 17

is the dimensionless ratio of a fluid density to a standard reference density.

Answer 17

Specific gravity

Question 18

s

Answer 18

Specific Gravity

Question 19

Specific gravity (s) formula

Answer 19

s = ρ ʟɪǫᴜɪᴅ / ρ ʜ2ᴏ @ 4°C

s = ρ ɢᴀs / ρ ᴀɪʀ

Question 20

Weight formula

Answer 20

w = mg
N or kN

Question 21

Mass density of water at 4°C

Answer 21

ρ = 1,000 kg/m³

Question 22

Unit or Specific weight of water at 4°C

Answer 22

γ = 9,810 N/m³

Question 23

Specific gravity of water at 4°C

Answer 23

s = 1.0

Question 24

Mass density of air

Answer 24

ρ = 1.23 kg/m³

Question 25

Unit or Specific weight of

Answer 25

γ = 12.1 N/m³

Question 26

Specific gravity of air

Answer 26

s = 0.00123

Question 27

Internal stickiness of a fluid

Answer 27

Viscosity (μ) (mu)

Question 28

Property of fluid which determines the amount of its resistance to shearing force.

Answer 28

Viscosity (μ) (mu)

Question 29

One of the properties of fluid that controls the amount of fluid that can be transported in a pipeline during a specific period of time.

Answer 29

Viscosity (μ) (mu)

Question 30

a device that measures the viscosity of a fluid

Answer 30

Viscometer

Question 31

Relationship between liquid viscosity and temperature

Answer 31

Indirectly proportional

viscosity of liquid decreases with increasing temperature

Question 32

Relationship between gas viscosity and temperature

Answer 32

Directly proportional

gas viscosity increases with increasing temperature

Question 33

What are the general properties of fluids

Answer 33

1. Mass density (ρ)
2. Unit or Specific Weight (γ)
3. Specific Volume (Vs)
4. Specific Gravity (s)
5. Viscosity (μ)
6. Surface tension (σ)
7. Vapor Pressure
8. Capillary Action

Question 34

It is the property of fluid that results from the attractive forces between molecules

Answer 34

Surface tension (σ)

Question 35

It manifests itself only in liquids at an interface, usually a liquid-gas interface

Answer 35

Surface tension (σ)

Question 36

Relationship between surface tension and temperature

Answer 36

Indirectly proportional

Surface tension of liquid decreases as their temperature rises

Question 37

Is explained by the phenomenon of surface tension combined with that of adhesion

Answer 37

Capillary Action

Question 38

Relationship between effect of capillary and size of tube

Answer 38

Indirectly proportional

The effect of capillary decreases as the size of the tube increases

Question 39

The pressure resulting from molecules in the gaseous state.

Answer 39

Vapor pressure

Question 40

It is the pressure of which the liquid will boil

Answer 40

Vapor Pressure

Question 41

μ

Answer 41

Viscosity

Question 42

σ

Answer 42

Surface tension