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Ficks law of diffusion
 diffusion= (P1P2)(Area)(solubility)
 
 (membrane thickness)(sq.root of MW)

Graham's law of diffusion
rate of diffusion = 1/sq root of density = 1/sq root of molar mass3.

Henry's Law
amt of gas that will dissolve in a liquid is proportional to the partial press of the gas in the gas phase
 allows determination of amts of gases (O2 and CO2) that will dissolve in blood

Amt of O2 tha dissolves in blood
0.003 ml/100 ml blood/mmHg partial press
so, if PaO2 is 300 mmHg, then 300 mmHg x 0.003= 0.9 ml O2/100 ml blood

laminar flow
change in P/airway resistance
 airway resistance = 8 x length x viscosity
 
 pi x radius to the 4th power

Reynolds number
 Re =linear velocity x diameter x fluid density
 
 viscosity
 low reynolds # (<1000) = laminar flow
 high reynolds # (>1500) = turbulent flow

poiseuille's law
used for laminar flow
F = (pi r4 change P)/(8 viscosity length)

Bernoulli's Principle
  r/t laminar flow
  based on total conservation of energy
E = PV + mgh + 1/2 mv2
in a narrowing, assuming constant flow, resistance & press will decrease in the narrowing
 R = change in P/ F
 R = 8(viscosity)(lenght)/(pi r4)

causes of turbulent flow
  rough tubing walls or kinks
  flow through orifice
  high velocity flow
flow exiting the narrowing becomes turbulent
turbulent flow is inversely related to density

absolute humidity
mass of water vapr in a given volume of air

relative humidity %
(actual vapor press/saturated vapor press) x 100

ohm's law
energy = current (amperes) x resistance (ohms)
E = IR

% inspired air
 % of inhaled air that is occupied by anesthetic has
 controlled by anesthetic machine

alveolar partial press
used as a determinant of brain partial press

