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Physics for Anesthesia > Test 2 > Flashcards

Test 2 Flashcards

1
Q

Specific heat of Ice and Steam

A

0.5 cal/ gm C

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2
Q

Heat of Fusion of Ice at 0 C

A

80 cal/gm

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3
Q

Heat of Vaporization of Water at 100 C

A

540 cal/gm

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4
Q

Conduction

A

Heat Transfer between touching solids (1-3% heat loss)

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5
Q

Convection

A

Heat transfer to air (30% heat loss)

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6
Q

Radiation

A

Thermal energy transfer to surroundings (electromagnetic waves) (40% heat loss)

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7
Q

Metabolic Rate for BSA (kcal/m^2 Hr)

A 
seated and quiet: 50
Standing, attentive:65
Pick and Shovel work: 220
Walking 2mi/hr: 100
3mi/hr: 130
5mi/hr: 290
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8
Q

Stefan-Boltzmann Law

A

Warmer stuff gives off more heat than cooler stuff

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9
Q

Skin Surface Temperature

A

306 K

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10
Q

RTP

A

293 K(20 C), 1 ATM, 1 mole of gas will occupy 24 L

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11
Q

BTP

A

310 K (37 C), 1 ATM, 1 mole of gas will occupy 25.4 L

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12
Q

STP

A

273 K (0 C), 1 ATM, 1 mole of gas will occupy 22.4 L

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13
Q

e

A

0.97 at infrared wavelengths

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14
Q

sigma

A

4.8 * 10^-8 kcal/m^2 *hr *K^4

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15
Q

Heat of Vaporization at BTP

A

580 cal/gm

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16
Q

Vapor Pressure of H2O at 37 C

A

47 mmHg

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17
Q

Temp Measuring Devices that use Volume Expansion

A

Mercury/Alcohol Thermometers, Bimetallic strip

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18
Q

Temp Measuring Devices that use Conductivity/Resistivity

A

Thermistor, Heated wire

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19
Q

Temp Measuring Devices that use Emisivity (electromagnetic activity)

A

Thermocouple, IR detector

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20
Q

Temp Measuring Devices that use Index of Refraction

A

Liquid Crystals

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21
Q

Effect thermocouple uses

A

Seebeck effect

22
Q

Ideal Gas Law

23
Q

Estimated Blood Loss

A

(Initial-acceptable/avg) x EVL

24
Q

Alveolar Gas Equation

A

PaO2=FiO2 x (Pb-PaH2O)-(PaCO2/R)

25
Critical Temperature
Temperature above which a substance cannot be liquified no matter how much pressure is applied
26
Critical Pressure
Vapor pressure at critical temperature
27
Don's Law
Constant volume, pressure of gas changes with temperature
28
Charle's/ Gay Lussac's Law
Constant pressure, volume of gas varies with temperature
29
Dalton's Law of Partial Pressures
P1= P2+ P3, pressure of gas mixture is additive.
30
US N2O filling Ratio
0.68
31
UK N2O filling Ratio
0.75
32
N2O in E cylinder
Pressure: 745 PSI, Volume 1590 L
33
N2O mass
44 g/mole
34
Critical Pressure of N2O
73 bar
35
Boyle's Law
Constant temperature, volume of gas varies with pressure
36
Normal Cylinder Pressure at 15 C
137
37
1 ATM =
101.33 kPa, 1013.3 mbar, 760 mmHg, 1033.6 cmH2O, 14.7 PSI
38
Water Capacity of cylinder
4.8 L (also possibly 4.68 and 4.5 depending on slide)
39
Absolute Humidity
Mass of H2O vapor in a given volume of gas at a specified temperature and pressure (normal patient value: 23mg/L)
40
Relative Humidity
Amount of Water expressed as % of maximum amount of water that could be present in a volume of gas at a specified temperature
41
Henry's Law
The solubility of a gas in liquid is inversely proportional to the temperature. The amount of water held in gas is directly proportional to the temperature.
42
Temperature
Measurement of average kinetic energy of substance being measured
43
Specific Energy
Energy in calories required to raise 1 g of a substance by 1 C (Water is 1 calorie)
44
Basal Heat Production for 70kg male
70 cal/hr at 20 C (can increase 5 fold in exposure to cold)
45
Stefan-Boltzman Law
E=e@ (T1^4-T2^4), proportional to 4th power of 2 different temperatures
46
Perfusion
Pressure and Flow
47
Shape of Dose Response Curve
Sigmoid
48
Force
Newton= kg*m/s^2
49
Pressure
Pascal=Kg/m*s^2
50
Energy
Joule=kg*m^2/s^2
51
Power
Watt=kg*m^2/s^3

Physics for Anesthesia (2 decks)

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