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Level 78

Cylinders & Ideal Gases


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Define critical temperature
Temperature above which a substance cannot be liquefied
Nitrous = 36.5 degrees C
What are the critical temperatures for Nitrous, Oxygen and Nitrogen?
Define critical pressure
Minimum pressure that causes liquefaction of a gas at its critical temperature.
Define specific critical volume
Volume occupied by 1kg of a gas at its critical temperature and pressure.
Gaseous state = above critical temperature
What is the relationship of critical temperature to gas and vapor?
Define adiabatic heating
the pressure of a gas is increased when it goes to a smaller volume.
Define adiabatic cooling
the pressure of a gas is decreased when it expands into a larger volume.
Open the valve slowly.
In regards to adiabatic heating, what must a CRNA always do when opening a cylinder valve?
Define the Joule Thompson Effect
Rapid volume loss into a large space = less energy per
During emptying of cylinder
When does the Joule Thompson Effect occur during anesthesia?
2200 PSI and 660 Liters
What is the service pressure (PSI) and capacity (in Liters) of a full oxygen cylinder?
745 PSI and 1590 Liters
What is the service pressure (PSI) and capacity (in Liters) of a full N2O cylinder?
1900 PSI, 625 Liters
What is the service pressure (PSI) and capacity (in Liters) of a full air cylinder?
450 Liters
If an Oxygen tank reads 1500psi, What is the volume of O2 in Liters?
960 Liters
If a N2O tank reads 450psi, What is the volume of N2O in Liters?
493 L
If an Air tank reads 1500psi, What is the volume of Air in Liters?
O2 PISS = 2-5
What is the PISS of O2?
N2O PISS = 3-5
What is the PISS of N2O?
Air PISS = 1-5
What is the PISS of Air?
Temperature, Volume and Pressure
Name the three components of ideal gas
Define vapor
a gas that co-exists in equilibrium with its corresponding liquid
Define Triple point
the temperature and pressure at which it exists simultaneously, in thermodynamic equilibrium, as a solid, liquid and gas.
Define the basic concept of molecular theory
Adding heat increases the motion of atoms and eventually changes the state of matter (i.e liquid to gas; solid to liquid)
Define ideal gas
a hypothetical gas consisting of identical particles of zero volume
Define Boyle's gas law
At a constant temperature the volume of a given mass of gas varies
P1V1 = P2V2
What is the formula for Boyle's gas law?
1 liter
1.06 quarts
18.18 cm H2O
a gas occupies a volume of 10 mL at a pressure of 40 cm H2O. What would the pressure need to be for the gas to occupy a volume of 22 mL?
Define Charle's Law
At constant pressure the volume of a given mass varies directly with temperature.
V1/T1 = V2/T2
What is the formula for Charle's gas law?
1.3 Liters
A gas occupies a volume of 1 liter at a temperature of 150 degrees Kelvin. What volume will it occupy at a temperature of 200 degrees Kelvin?
4.55 L
a gas comprises a volume of 6.5 liters at a temperature of 300 degrees Kelvin. If we reduce the temperature to 210 degrees Kelvin, what volume would it occupy?
Define Gay-Lussac's Law
At constant volume the absolute pressure of a given mass varies directly with the absolute temperature
P1/T1 = P2/T2
What is the formula for Gay-Lussac's Law
149.76 mmHg
a gas is at a temperature of 250 degrees Kelvin at a pressure of 120 mmHg. What will the pressure of the gas be if you heat it to 312 degrees Kelvin?
231.86 degrees K
we start with a pressure of 2.4 atm and a temperature of 265 Kelvin. What will the temperature of the gas be if we decrease the pressure to 2.1 atm?
P1V1/T1 = P2V2/T2
what is the formula for the combined gas law?
117 L
I have an unknown volume of gas at a pressure of 0.5 atm and a temperature of 325 K. If I raise the pressure to 1.2 atm, decrease the temperature to 320 K, and mea…
What is Avogrado's number?
6.022 x 10^23 particles per mole
The most important consequence of Avogadro's law is the following
The ideal gas constant has the same value for all gases.
State Avogadro's law
Equal volumes of gases, at the same temperature and pressure, contain the same number of particles, or molecules.
22.7 Liters
What is STP?
272.4 Liters
Calculate the volume 12 mole of N2O would occupy at STP
8.4 Liters
0.37 mole of Helium at STP would occupy how much space
10.1 L
How much volume does 19.6 g of N2O occupy at STP?
Define the ideal gas law
The state of an amount of gas is determined by its pressure, volume, and temperature
PV = nRT
Equation for gas law
0.967 L
If I have 0.275 moles of gas at a temperature of 75 K and a pressure of 1.75 atmospheres, what is the volume of the gas?
Define Dalton's Law
The total pressure exerted by a gaseous mixture is equal to the sum of the partial pressures of each individual component in a gas mixture.