Fluid Density and Pressure

Question 1

Fluid

Answer 1

Solids are not, but gas and liquids are (anything that can change it’s shape according to its container)

Question 2

Density

Answer 2

How much “stuff” is packed into a space. p=m/v

Units: kg/m^3 but, this is not very helpful so we use smaller units like g/mL, g/cm^3 or kg/L

Question 3

Density of pure water at 4C and 1 atm

Answer 3

1 g/mL or 1 g/cm^3 or 1 kg/L

or 1000 kg/m^3

Question 4

Specific gravity

Answer 4

Density of a liquid relative to water (a ratio of liquid:water)
-unitless

Question 5

Fluid pressure

Answer 5

Not limited to fluids

Question 6

Units of pressure

Answer 6

P=F/A or N/m^2 which is also known as a pascal (pa)

Question 7

The units of psi

Answer 7

lbs/in^2

Question 8

1 atm

Answer 8

Standard atmosphere
101,000 pascals
also =760 mmHg = 760 Torr= 14.7 psi = 1 bar (slightly less than an atm)

Question 9

Hydrostatic pressure`

Answer 9

Psub = (rho)gh
h=height
g=gravity

Question 10

Absolute pressure

Answer 10

P_abs=P_hydro + P_atm

Question 11

Gauge pressure

Answer 11

-not standard pressure

P_gauge = P_system - P_atm