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# Respiratory Gas Laws

### GAS LAWS

What is STPD and why is it important? Standard Tempeture and Pressure Dry- water vapor occupies space, therefor dry gas has a lower volume than "wet"/saturated volume. It is clinically important when discussing gas pressures in the lung where things are "wet".
What is the term used to discribe the quantity of water in a particular volume of air thats most common units are shown in grams per cubic meter? Absolute Humidity.
What is absolute zero? A tempeture in which there is no kenetic energy.
Which law predicts how much of a given gas will disolve in liquid? Henry's Law (V = a X P gas)
Which gas law states, at a consistant tempeture the pressure of a gas inversely proportional to the volume? Boyles Law.P1V1 = P2V2
Which law states, when you change the tempeture of a gas the pressure changes? Gay-Lussac's Law.P1/T1 = P2/T2
Wich law has no constant factor but has all the same properties as three other laws? The Combined Gas Law.(P1V1)/T1 = (P2V2)/T2
Which law staes the total pressure of a gas mixture must = the sum of the partial pressures of all its parts? Dalton's Law of Partial Pressure.
What is Buoyancy and what principal does it belong to? Archimedes Principle- pressure below a submerged object is higher than pressure above it (this difference is an upward force).
Define laminar flow. A pattern of flow consisting of concentric layers of fluid flowing parallel to the tube wall at linear velocities that increase towards the center.
Define turbulent flow. The pattern of flow through a tube changes significantly, with a loss of regular streamlines. Fluid molecules form irregular eddy currents in a chaotic pattern.
What are the three primary states of matter? Solids, liquids and gases.
What is flow resistance? The difference between pressures at two points along a tube divided by flow.
The change in pressure required to produce a given flow (under laminar flow conditions) through a smooth tube of a fixed size is which law? Pouseuille's Law.
What is capillary action and how does it affect the Respiratory therapist? A phenomenon in which a liquid in a small tube upward against gravity. This is important because of blood sampling and some of the absorbent wicks used in some of the gas humidifiers.
What is the dew point? The temperature at which water vapor condenses back to its liquid form.
What is the barometric pressure formula? pressure=height of column X density of liquid
If we have two liters of a gas at a tempeture of 420 K, what will the new volume be? What law will you use to solve the problem? You would use the Combined gas law to find the answer. since pressure was never mentioned, ignore it. The equation is V1/T1 = V2/T2 2L/420 = x /350 answer= 1.67L
What law states the lighter gases diffuse more rapidly and heating or agitation of gases speed up diffusion (based on kenetic energy). Grahams Law.
What does Pascal's principle tell us? It tells us that a static liquid pressure depends on the depth of the fluid.P = H x density
Created by: CLEBLANC