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RTH 102 Physics > Physics > Flashcards

Physics Flashcards

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1
Q

no forces of what exist between molecules

A

mutual attraction

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2
Q

what do most gas law calculations need to take into consideration

A

water vapor - 47mmhg

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3
Q

dry volume is ____ than saturated volume

A

less than

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4
Q

pressure exerted by water is dependent only on what 2 things

A

temperature and relative humidity

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5
Q

what does the addition of water always do to the partial pressure of other gases

A

lowers the partial pressure of the other gases present

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6
Q

how is pressure defined

A

force exerted per unit area of surface

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7
Q

conversion factor for 1atm to mmgh

A

1 atm = 760 mmhg

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8
Q

conversion factor for 1 atm to cmhg

A

1 atm = 76 cmhg

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9
Q

conversion factor for 1 atm to kpa

A

1 atm - 101.3 kpa

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10
Q

conversion factor for 1 atm to torr

A

1 atm = 760 torr

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11
Q

conversion factor for 1 atm to inches Hg

A

1 atm = 29.92 inches Hg

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12
Q

when you compress a gas what happens to the mass

A

the mass remains unchanged

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13
Q

when you compress a gas what happens to the volume

A

the volume decreases

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14
Q

when you compress a gas what happens to the density

A

the density of the gas is greater

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15
Q

what does a static liquid pressure depends solely on _____ and _______ of the fluid

A

depth & density

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16
Q

what does the pressure exerted by a liquid in motion depend on

A

the nature of the flow itself

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17
Q

if there is no flow what does the pressure measure

A

pressures are equal

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18
Q

if there is a progressive decrease in pressure what is happening with flow

A

fluid is flowing

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19
Q

what does a decrease in pressure reflect in terms of energy

A

reflects loss of energy

20
Q

what do frictional forces oppose

A

fluid flow

21
Q

where does frictional resistance to flow exist

A

within the fluid itself (viscosity) and b/w the fluid and tube wall

22
Q

how do u get more resistance with a fluid

A

smaller tube and greater viscosity

23
Q

in terms of fluid dynamics what type of flow is slower

A

laminer flow

24
Q

define laminar flow

A

fluid moving in discrete cylindrical layers or streamlines

25
Q

if a fluid is more streamline what does that mean in terms of motion

A

it is a constant forward motion

26
Q

in terms of fluid dynamics what type of flow is faster

A

turbulent flow

27
Q

define turbulent flow

A

loss of regular streamlines; fluid molecules form irregular eddy currents in a chaotic pattern

28
Q

what does resistance equal

A

the pressure difference divided by the flow

29
Q

how do you increase driving pressure with laminar flow

A

increase fluid viscosity, tube length, or increase the flow

30
Q

poiseuille’s law

A

pressure will increase whenever the fluid viscosity, tube length, flow increases, or radius decreases

31
Q

what are factors in turbulent flow

A

fluid density, viscosity, linear velocity, and radius

32
Q

what is transitional flow

A

mixture of both laminar and turbulent flow

33
Q

how is flow measured

A

flow = L/sec

34
Q

how is velocity measure

A

velocity = distance per time cm/sec

35
Q

what is the same about flow and velocity

A

their concepts are the same

36
Q

law of continuity

A

velocity of fluid moving through a tube or a constant flow varies inversely with the available cross section area

37
Q

in terms of flow as the area decreases what happens to the speed

A

it increases

38
Q

what happens in the alveoli in terms of speed

A

even tho the alveoli airways are smaller, there is more surface area so speed is greatly reduced

39
Q

bernoulli effect

A

fluid passing through a tube that meets a constriction experiences a significant pressure drop and gains speed (example venturi mask)

40
Q

what happens when fluid that flows through the constriction

A

flow increases in velocity while the lateral wall pressure decreases

41
Q

define effusion

A

passing of gas molecules through a tiny opening in a container

42
Q

what is kinetic energy determined by

A

temperature of the gas

43
Q

what is the rate of diffusion inversely related to

A

square root of its molar mass

44
Q

what 4 things do you need to completely describe a gas

A

pressure, temperature, volume, number of particles

45
Q

particles in an ideal gas

A

dont attract or repel each other, and have an avg. kinetic energy that is directly related to kelvin temperature

46
Q

particles in a real gas

A

have their own volume and attract each other

47
Q

gas behavior is most ideal..

A

at low pressures
at high temperatures
in nonpolar atoms/molecules

RTH 102 Physics (1 decks)

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