Physics Gas/fluid Flashcards
Pressure
Force over Area P=f/a
Standard is Pascal which is 1 newton over 1 square meter. 1 newton=102grams
Absolute pressure
Measured relative to a full vacuum
Gauge pressure
Measured against atmospheric pressure
Temperature conversions
K
C
F
Celsius to Kelvin K= C+273
Celsius to Fahrenheit F= 1.8(C)+32
Fahrenheit to Celsius= C= (F-32)/1.8
Standard temperature is 273.15 (0C)
Universal Gas law
PV= nrT
N=moles
R=constant
T=temp in K
At what temp will an O2 cylinder exceed its recommended pressure?
Avogadros number
In a mole of any gas there are
6.023x10^23 molecules
Daltons Law
Pressure is the sum of the pressure of each individual gas
Boyle’s Law
At constant temperature the volume of a gas will vary inversely with the pressure
Normal tidal breathing
Charles law
At constant pressure a volume will vary directly with temperature
O2 tank exploding
Gay-Lussacs Law
At constant volume the pressure of a gas will vary directly to the temperature
Poiseuilles Law
Only to Laminar flow
Flow rate is directly proportional to rate and pressure
And also to tube length and viscosity
Bernoullis principle
Fluid flowing through a narrowed portion will increase velocity
Coanda effect
What happens to pressure within a constricted area?
Fluids and gases will cling to the area of lower pressure when emerging from a constriction if it then encounters a bifurcation
Venturi effect
Reduction in pressure that results when a moving fluid speeds up as it flows through a constricted section
Laplaces law
The larger the vessel radius the larger the wall tension required to withstand a given internal fluid pressure
