Fluid Statics 1

Question 1

How can forces be calculated?

Answer 1

In terms of pressure distribution of the fluid

Question 2

What impacts do molecules have with walls?

Answer 2

• Elastic
• Energy and momentum conserved

Question 3

What type of forces is pressure?

Answer 3

Normal

Question 4

What is the gas pressure?

Answer 4

The force per unit area on the piston

Question 5

What is the unit for pressure?

Answer 5

Pascals

Question 6

What is 1 bar equal to?

Answer 6

10e5 Pa

Question 7

What is atmospheric pressure?

Answer 7

101,325 Pa

Question 8

How are large pressures produced?

Answer 8

When small forces act over small areas

Question 9

How can small pressures be produced?

Answer 9

When large forces act over large areas

Question 10

What is the transmission of pressure like in a fluid?

Answer 10

Fast but not instantaneous

Question 11

What does the transmission speed of pressure depend on?

Answer 11

The speed of sound in the medium and shape of the container

Question 12

What do hydraulic presses use to produce large forces?

Answer 12

The transmissibility of pressure

Question 13

What is the absolute pressure?

Answer 13

Pressure with respect to a vacuum

Question 14

What is gauge pressure?

Answer 14

Pressure measured relative to a local atmospheric pressure

Question 15

How can gauge pressure be calculated?

Answer 15

Pgauge = Pabs - Patm

Question 16

What is the net force on a fluid in a static situation?

Answer 16

Zero

Question 17

What is the equation of fluid statics?

Answer 17

dP/dz =ρ * g

Question 18

How does pressure change?

Answer 18

With depth

Question 19

How does pressure behave in the horizontal plane?

Answer 19

It is constant

Question 20

What’s the equation for mass when density constant?

Answer 20

m = rho* A * (z*)

Question 21

What’s the pressure when density constant?

Answer 21

P = P_0 + rhog(z*)

Question 22

What is the pressure difference equal to?

Answer 22

The fluid weight per area

Question 23

How does pressure increase when density constant?

Answer 23

Linearly

Question 24

What is the water level like in connected tubes in a reservoir?

Answer 24

The same level of water as in the reservoir

Question 25

What is the density of a gas like compared to a liquid?

Answer 25

Much smaller

Question 26

What is a manometer used for?

Answer 26

Measuring pressure difference between two locations in a flow

Question 27

What does manometers look like?

Answer 27

U-tubes