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Physical Laws
Lecture 3
35
Medical
Graduate
08/27/2015

Additional Medical Flashcards

 


 

Cards

Term
Pressure
Definition

Pressure= Force/Area

 

expressed in pounds per square inch 

Term
Pascal (Pa)
Definition
(Pa)= 1 Newton/square meter
Term
100kPa
Definition

1 bar (0.987 atm)

 

 

Term
Ideal Gas Law
Definition
An ideal gas exerts no pressure and has no volume at 0 degrees Kelvin
Term
Boyle's Law
Definition

Pressure and volume are inversely related

 

PV= Constant

 

or

 

PV=P1V1

Term
Charles' Law
Definition

Volume and temperature are directly related

 

V/T= constant

 or

V/T= V1/T1

 

Heating an ideal gas causes it to expand 

Term
Gay-Lussac's Law
Definition

Pressure and temperature are directly related

 

P/T=Constant

 

P/T= P1/T1

Term
Combined Gas Laws
Definition

PV/T= constant

 

or

 

PV/T=P1V1/T1

Term
Adiabatic Compression and Expansion
Definition
Gas is so rapidly compressed or expanded that the distribution of the heat produced cannot occur
Term
Fick's Law
Definition
The rate of gas diffusion is proportional to the gradient
Term
Graham's Law
Definition

The rate of diffusion is inversely proportional to the square root of molecular size

 

aka Large molecules move more slowly 

Term
Henry's Law
Definition

The partial pressure of a gas in a liquid is proportional to its partial pressure in the gas phase 

 

Pa(Gas)= Pa(Liquid)

Term
Dalton's Law
Definition
The total pressure of gases in a liquid is equal to the sum of the partial pressures of the gas overlying the liquid
Term
Ostwald Coefficients
Definition

Blood-gas coefficient

 

Oil- gas coefficent

 

Tissue-gas coefficient 

Term
Blood-Gas Coefficient
Definition
Inversely correlates with the speed of induction
Term
Oil- Gas Coefficient
Definition
Correlates directly with the potentcy of the agent and inversely with the MAC of the agent
Term
Tissue-Gas Coefficient
Definition
Correlates with the length of time for emergence
Term
N2O Blood Gas Coefficient
Definition
0.47
Term
N2O MAC
Definition
104
Term
N2O Vapor Pressure
Definition

745 (psi)

 

38,500 mmHg

Term
Desflurane Blood/ Gas Coefficient
Definition
0.42
Term
Desflurane MAC
Definition
6.3
Term
Desflurane Vapor Pressure
Definition
690
Term
Sevoflurane Blood/Gas Coefficient
Definition
0.68
Term
Sevoflurane MAC
Definition
1.71
Term
Sevoflurane Vapor Pressure
Definition
185
Term
Isoflurane Blood/Gas Coefficient
Definition
1.4
Term
Isoflurane MAC
Definition
1.15
Term
Isoflurane Vapor Pressure
Definition
250
Term
Ohm's Law
Definition

P=QR

 

or 

 

Pressure= flow x resistance 

Term
Hagan-Poiseuille Equation
Definition

R= 8Ln/∏r4

 

Resistance=8(vessel length)/∏(vessel radius)4

Term
Inward Force
Definition
Diameter x Tension= (2∏r)Tension
Term
Outward Force
Definition
Area x Pressure= ∏r2(Pressure)
Term
LaPlace Equation
Definition

2∏rT=∏r2P

 

T=Pr/2

Term
1 atm
Definition
1.013 bar
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