Pressure And Atmosphere

Question 1

Pressure is defined as and is measured in

Answer 1

Force per unit area
Ounces per inch², pounds per square inch(psi) pounds per square ft, kilopascals per square m or pascals per square meter

Question 2

Force is defined as and how is it Calculated

Answer 2

A simple push or pull of weight not restricted to area, calculated entire area

Question 3

6 principles of hydrostatics

Answer 3

Fluid pressure is exerted in all directions
The shape of the container does not affect fluid pressure
Fluid pressure is proportional to depth
Horizontal runs do not increase pressure
the volume of Fluid does not affect pressure

Question 4

How much pressure does 1m and 1ft of water exert

Answer 4

9.81kPa
0.433psi

Question 5

What 2 factors affect pressure

Answer 5

Height and density

Question 6

Absoutle pressure to gauge=
Gauge pressure to absoutle=

Answer 6

absolutle pressure minus 1 atmosphere (101kpa or 14.7psia)
Gauge pressure plus 1 atmosphere

Question 7

What is Boyle’s law

Answer 7

As pressure increases, volume decreases, or as pressure decreases volume increases if the temp is constant

Question 8

To raise the boiling point of water you would need to increase or decrease pressure?

Answer 8

Decrease

Question 9

Weight of air based on STPwhat is that imperial and metric

Answer 9

Imperial: 60°F and 29.92 HG (mercury) absoutle with a density of 0.076ft³

Metric: 0°C at 101kpa at which air has a density of 1.29kg/m

Question 10

The largest mixture of gas in air 78%____ and 21%_____ with 1% other gases

Answer 10

Nitrogen and oxygen

Question 11

What is Charle’s law

Answer 11

As temperature increases volume increases, as tempature decreases volume decreases. Pressure constant

Question 12

What is absoutle pressure

Answer 12

A pressure reading that includes atmospheric pressure 14.7psi or 101kPa

Question 13

What is Gauge pressure
What does it equal

Answer 13

The difference in pressure from inside and the existing atmospheric pressure outside.
Guage pressure= absolutle pressure minus 1 atmosphere (14.7psia or 101kPa)

Question 14

What does not affect pressure, what does

Answer 14

Shape of container and volume does not affect
Depth and density of fluid

Question 15

A water column that is 1” high and a base of 1”squares weighs how much? It has a base pressure of what in psi and oz

Answer 15

0.0361lbs
Base has a pressure of 0.361psi
0.578 is(16oz in a lb so 0.0361×16oz)

Question 16

1” high of mercury exerts a pressure of what (RD of mercury is 13.6)

Answer 16

0.491psi(0.0361water×13.6merc)

Question 17

What is the formula for pressure

Answer 17

Pressure = heightxdensity
Height = pressure/density
Density =pressure/height

Question 18

Formula used for force using this triangle

Answer 18

Force = area×pressure
Area= force/pressure
Pressure= force/area

Question 19

What does this formula represent and what do the letters mean

Answer 19

Boyle’s law
V1=originalvolume
V2=new volume
P1=original pressure
P2=new pressure

Question 20

Types of barometer

Answer 20

Mercury barometer and aneroid

Question 21

The maximum theoretical and practical suction lift for a suction pump

Answer 21

33’11” or 10.34m theoretical
Closer to 7 meter (23’ to 26’)

Question 22

For every 1000’ (300m) what decreases
For every 2000’ above sea level
For every 90meters above sea level

Answer 22

1”(25mm) HG
1psi
1 kpa

Question 23

1ft3 block of wood weighs 250lbs, how much water would be displaced.

Answer 23

62.4lb, has the same volume of water