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Physics > Physics > Flashcards

Physics Flashcards

1
Q

Critical temperature

A

Temperature above which, no matter how much pressure apply cannot liquefy a gas

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2
Q

Pseudocritical temperature

what is it

what does it normally describe

whats the temp of that gas

A

Crit temp mix gas, 50:50 mix O2 & Nitrous seperates

-7-5.5 depending on pressure

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3
Q

Clark / Poloragaphic electrode

A

Platinum anode silver cathode & external power source

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4
Q

Galvanic

A

Gold & lead - own power

Current generate is proport to PP O2

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5
Q

Pouiselles

A

Q = ΔPπr4/8Lη

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6
Q

Frequency wavelength velocity formula

A

λ = v/f

frequency (f), wavelength (λ) and velocity (v) is as follows:

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7
Q

gauge pressure

A

Amount by which the pressure measured in a fluid exceeds that of the atmosphere
Dir releate to SVP & temp
(not Volume, weight or pressure)

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8
Q

Radioactivity unit & define

A

Becquerel Disintegration of 1 nucleus every second

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9
Q

Force =

A

Mass x acceleration

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10
Q

Capacitance =

A

Charge / voltage

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11
Q

Kinetic energy=

A

1/2 mass x velocity^2

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12
Q

Charge =

A

Potential x capicatance

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13
Q

7 Fundamental SI units

A 
Second
Metre
Mole
Ampere
Candela
Kelvin
Kg
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14
Q

Second is

A

Frequency of radiation Caesium 133

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15
Q

Metre is

A

Length light travel in vacuum during specified fraction second

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16
Q

Mole is

A

Amt of substance contain elementary many particle as atoms 0.012kg C 12

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17
Q

Ampere is

A

Current prod force 2 x10-7 n/m between 2 conductor 1m apart in vacuum

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18
Q

Candela is

A

Luminous intensity - perfect black body @ spec high temp

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19
Q

Kelvin is

A

Fraction 1/273.16 thermodynamic temp of triple point of h2o

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20
Q

Kilogram is

A

Defined international prototype at Sevres

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21
Q

4 derived electricity units

A

Volt
Ohm
Coulomb
Farad

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22
Q

7 derived Non electrical unit

A 
Hertz
Pascal
Acceleration
Newton
Joule
Electron volt
Watt
Celsius
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23
Q

Volt is

A

Electric potential

1v = diff electrical potential between 2 points of conduct, carrying current 1 ampere power dissipated 1 watt

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24
Q

Ohm is

A

Electrical resistance

Potential 1 volt apply across conductor & produces 1 ampere resistance = 1 ohm

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25
Q

Coulomb is

A

Unit charge / quantity electricity

1 coulomb quantity electricity transported in 1s by 1 ampere

26
Q

Farad is

A

Capacitance

1 farad capacitor potent difference 1 volt present across plates - charge 1 coulomb held

27
Q

Hertz is

A

Frequncy

1 cycle per second

28
Q

Newton

A

Force

1 newton give mass 1 kg & accel 1 metere per second per seocnd

29
Q

Pascal

A

Pressure

Pressure of 1 newton per square metere

30
Q

Joule

A

Unit energy / work

expended point of application of force 1n move 1 metre - direction force

31
Q

Electronvolt

A

Unit energy typer electromagnetic radiation

Energy - move 1 electron through ptoetnial difference 1 volt in vacuum = 1.6 x 10-19 joule

32
Q

Watt

A

Power

Rate energy expenditure 1 watt = 1 joule/sec

33
Q

Celsius

A

Temperature
1 degree identical 1 kelvin
1 Celsius = 1kelvin -273.15

34
Q

What is STP

A

101.325 Kpa & 273.15 K

35
Q

Avogadro’s Hypothesis

A

Equal volumes of gas at STP contain equal numbers of moles

Mol wt may differ - but no molecules same

36
Q

Oxygen

Crit temp, cylinder, % o2 at altitude

A

Crit temp - cannot be liquefied no matter how much pressure
-118.6 (cannot be liquefy at room temp)
Black cylinder white shoulder
Same % O2 at altitude, PP reudced

37
Q

OHMs law

A

Pot diff = Flow x Resistance
V = IxR
R = V/I

38
Q

PVR =

A

MPAP − PCWP / CO × 80

39
Q

Seebeck effect

A

Potential difference (V) @ 2 conductor - proport to temp

40
Q

Thermistor

A

Resistance falls exponentially as temp rises

41
Q

Platinum resistance wire

A

resistance increases linear w/ temperate

42
Q

Coanda Effect

A

Development reduced pressure between fluid jet from nozzle & adjacent surface
Jet adhering to surface
Control mech in vent

43
Q

Fick principle

A

calc blood flow / unit time to any organ

Measure CO

44
Q

Turbulent Flow calculation

A

Q =r2. √ΔP/L.density

Therefore turbulent flow is proportional to:
The radius ^2
The square root pressure gradient and
Is inversely proportional to length and the density of the fluid

45
Q

Reynolds number

A

Flow becomes turbulent, inverse to viscosity
Re >2000 - turbulence likel
Re -2000-4000 transitional flow

46
Q

PAC Est w/ CO

A

Thermodilution
inject cold solution smoothyl over 4s
AUC temp change @ dist end of thermistor

47
Q

PAC Est w/ CO

A

Thermodilution
inject cold solution smoothyl over 4s
AUC temp change @ dist end of thermistor

48
Q

Damping

Factors

A

Progressive decrease in amplitude of oscillation d/t dissipation energy
Undamped = 0 Crit damp = 1 Optimally damp 0.64

49
Q

Resonant

A

Driving force frequency coincides w/ resonant freq system
tubing too long / stiff
Diaphragm may also be too stiff

50
Q

Impedence

A

When resistance depends on frequency

51
Q

Capacitor

A

Stores energy in electrical field.
Resist instant change volatge
doesnt conduct DC

52
Q

Beers law

A

Absorption of radiation - given thickness solution - given conc - same twice thickness of a solution of half the concentration

53
Q

Bougner’s or Lambert’s Law

A

Each layer of equal thickness absorbs an equal fraction of radiation which passes through it

54
Q

Boyles law

A

Constant temp volume gas inverse proport to abs pressure

55
Q

Grahams Law

A

Rate diffusion gas Inverse proport to square root molar weight

56
Q

Raoult

A

Depression / Reduction vapour pressure of solvent proportional to molar conc solute

57
Q

Art line frequency

A

0.5 - 40Hz

58
Q

Nautral frequency

A

frequency at which the monitoring system itself resonates amplifies signal should be at least x10 fundamental frequency.
The natural frequency is directly related to the catheter diameter (not indirectly).
It is inversely related to the square root of the: system compliance, length of tubing and the density of the fluid in the system.

59
Q

Doppler effect

A

Apparent change in frequency

cause by movement of object in `relation to source

60
Q

Bernoulli principle

utilised

A 
Increase in the flow velocity of an ideal fluid will be accompanied  simultaneous reduction in its pressure
Fluid logic ventilators
Gas driven nebulisers
Jet ventilation devices 
Venturi oxygen mask
61
Q

How does a thermocouple work

A

bimetallic strip has a junction potential proportional to temperature

Physics (11 decks)

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