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Physics for Anesthesia > Test 2 > Flashcards

Test 2 Flashcards

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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

A

PV=nRT

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
Q

Critical Temperature

A

Temperature above which a substance cannot be liquified no matter how much pressure is applied

26
Q

Critical Pressure

A

Vapor pressure at critical temperature

27
Q

Don’s Law

A

Constant volume, pressure of gas changes with temperature

28
Q

Charle’s/ Gay Lussac’s Law

A

Constant pressure, volume of gas varies with temperature

29
Q

Dalton’s Law of Partial Pressures

A

P1= P2+ P3, pressure of gas mixture is additive.

30
Q

US N2O filling Ratio

A

0.68

31
Q

UK N2O filling Ratio

A

0.75

32
Q

N2O in E cylinder

A

Pressure: 745 PSI, Volume 1590 L

33
Q

N2O mass

A

44 g/mole

34
Q

Critical Pressure of N2O

A

73 bar

35
Q

Boyle’s Law

A

Constant temperature, volume of gas varies with pressure

36
Q

Normal Cylinder Pressure at 15 C

A

137

37
Q

1 ATM =

A

101.33 kPa, 1013.3 mbar, 760 mmHg, 1033.6 cmH2O, 14.7 PSI

38
Q

Water Capacity of cylinder

A

4.8 L (also possibly 4.68 and 4.5 depending on slide)

39
Q

Absolute Humidity

A

Mass of H2O vapor in a given volume of gas at a specified temperature and pressure (normal patient value: 23mg/L)

40
Q

Relative Humidity

A

Amount of Water expressed as % of maximum amount of water that could be present in a volume of gas at a specified temperature

41
Q

Henry’s Law

A

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
Q

Temperature

A

Measurement of average kinetic energy of substance being measured

43
Q

Specific Energy

A

Energy in calories required to raise 1 g of a substance by 1 C (Water is 1 calorie)

44
Q

Basal Heat Production for 70kg male

A

70 cal/hr at 20 C (can increase 5 fold in exposure to cold)

45
Q

Stefan-Boltzman Law

A

E=e@ (T1^4-T2^4), proportional to 4th power of 2 different temperatures

46
Q

Perfusion

A

Pressure and Flow

47
Q

Shape of Dose Response Curve

A

Sigmoid

48
Q

Force

A

Newton= kg*m/s^2

49
Q

Pressure

A

Pascal=Kg/m*s^2

50
Q

Energy

A

Joule=kg*m^2/s^2

51
Q

Power

A

Watt=kg*m^2/s^3

Physics for Anesthesia (2 decks)

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