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c/p test 2 part 1
pressure, flow, boiling point, vaporization, heat, temp and energy
58
Chemistry
Graduate
02/15/2012

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Term
force
Definition
an influence on an object with mass that results in a change in velocity of the mass.
Term
work
Definition
force acting over a distance
Term
energy
Definition
measure of the amount of work done, in a sense same as work
Term
newtons, dynes, joules
Definition
measure of force
Term
dyne
Definition
force that will accelerate 1gm/1m/sec
Term
joule
Definition
work done by force of 1 newton
Term
velocity
Definition
distance traveled per unit time
Term
kinetic energy (KE)
Definition
inherent energy in motion of a body
mass x (velocity squared)/ 2
as velocity and mass increase this increases
Term
pressure
Definition
force exerted by atoms and molecules
force/area
Term
density effect
Definition
increase in density= increase pressure
Term
resistance
Definition
passive force exerted in opposition to another and active force.
Term
friction
Definition
resistance to flow in a tube caused by adhesive and cohesive forces
Term
viscosity
Definition
measure of fluids internal resistance to flow, increases with increasing intermolecular forces
Term
pressure in regards to flow
Definition
change in pressure= flow x resistance
Term
pascal's law
Definition
an external pressure is applied to a confined fluid the pressure is transmitted unchanged to every point within the fluid (hydraulic system)
Term
atmospheric pressure
Definition
total force of gas on the earth's surface
Term
ambient pressure
Definition
pressure surrounding the organism, could be anywhere
Term
torr
Definition
unit of pressure to support 1mm column at Hg at 0 degrees Celcius,
Term
partial pressure
Definition
pressure exerted by a single component gas of a mixture of gases.
Term
Partial pressure of oxygen at sea level
Definition
.21 x 760= 160 mmHg
Term
critical pressure
Definition
min pressure necessary to liquefy gas at its critical temperature
Term
critical temperature
Definition
Temp above which a gas can not be liquefied regardless of amount of pressure applied
Term
poiseuilles law
Definition
relates volume of flow through a tube:
pie x r (4th power) change P/8 n L
looks at diameter, pressure differential, length and viscosity
l=length, n=viscosity
Term
graham's law
Definition
relates flow through an orifice
1/square root MW
Term
laminar flow
Definition
flow = 1/viscosity
inversely proportional to viscosity
more compressed diameter the faster the flow
Term
turbulent flow
Definition
1/ square root density
inversely proportional to density
Term
critical flow rate
Definition
velocity at which a liquid or gas turns from laminar to turbulent flow. decreased diameter will increase turbulent flow
Term
bernoulli's theorem (continuity law)
Definition
in a tube of varying diameter a decrease in diameter results in an increase in velocity.
-tube of varying diameter velocity is inversely proportional to velocity.
- as speed of fluid increases the pressure exerted by the fluid decreases.
Venturi effect is an example
Term
venturi flowmeter
Definition
demonstrates the venturi effect where a pressure differential is created by changing the diameter of a tube. This sub atmospheric pressure draws a second gas inward and allows mixture with first gas.
application: variable orifice flowmeter
Term
boiling point
Definition
temp at which the vapor pressure of a liquid equals ambient pressure
(enough heat energy to activate molecules to leave liquid state to gas state)
at elevation requires less energy bc less atm pressure.
Term
bp desflurane
Definition
22.8
Term
bp isoflurane
Definition
48.5
Term
bp halothane
Definition
50.2
Term
bp enflurane
Definition
56.5
Term
bp sevoflurane
Definition
58.5
Term
dew point
Definition
temp at which if a volume of air is cooled moisture precipitates out.
increased temp: more water can be held
decreased temp: less water can be held
Term
vaporization
Definition
conversion of a volatile liquid to a gas/vapor
process by which particles escape from the surface of
a liquid
-endothermic
-will eventually cease due to cooling unless heat is applied to system
Term
vapor pressure
Definition
pressure exerted by vapor particles in equilibrium with a liquid
-polarity, mass and temperature (factors that effect VP)
Term
latent heat of vaporization
Definition
amount of heat absorbed to convert a liquid to a gas at its BP.
Term
vp of halothane
Definition
244
Term
vp of desflurane
Definition
669
Term
vp methoxyflurane
Definition
22.5
Term
vp enflurane
Definition
172
Term
vp isoflurane
Definition
240
Term
vp sevoflurane
Definition
160
Term
vp water
Definition
17.5
Term
heat
Definition
form of energy transferred from a hotter substance to a cooler substance
flows from high to low
Term
temperature
Definition
measure of conductivity of molecules and kinetic energy of molecules
-thermal state of a substance which determines whether it will give heat to another substance or receive heat from another substance
Term
fahrenheit to centigrade
Definition
c= (f-32) x 0.56
Term
centigrade to fehrenheit
Definition
f= (c x 1.8) + 32
Term
centigrade to kelvin
Definition
k= c + 273
Term
endothermic
Definition
requires input of energy
ice --->water----> vapor
Term
exothermic
Definition
requires output of energy
vapor--->water--->ice
Term
heat loss types
Definition
conduction, convection, radiation, evaporation
Term
conduction
Definition
heat transferred from one point to another by direct contact
ex: patient on OR table
Term
convection
Definition
heat transfer with fluid flow over a solid while temp is different between fluid and solid
ex: bear hugger (?)
Term
radiation
Definition
transfer of heat by divergence in all directions from a center
ex: body heat will radiate to other objects in a room
Term
evaporation
Definition
transfer of heat converting a liquid to a vapor
ex: humidification of dry inspired gas
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