# Physical Principles of RT Part 3.txt

 Factors that influence vaporization? Temp., Pressure, Surface area How does Temp. influence vaporization? Increased will increase the rate, decreased will decrease the rate. How does pressure influence vaporization? Air pressure above opposes vaporization. Low will allow more to happen. How does the surface area influence vaporization? Greater area, great rate of vaporization. What are the properties of gases? Exert pressure, capable of flow, exhibit the property of viscosity, readily compressed and expanded, fill the spaces available to them by diffusion, and velocity of gas molecules are directly proportional to temp. Avogadro's number? 6.023X10^23 States that 1 gram atomic weight of any substance contains exactly the same number of atims, molecules, or ions. Avogadro's Law is the ideal volume for one mole of a gas. Molar Volume. What is the ideal molar volume of any gas at STP? 22.4L Is the ratio of substance's mass to its volume. Density What is the formula for density? d(w)=gmw/22.4 is a substance that has a high atomic weight and the particles are packed more closely together. dense substance is a substance has a low concentration of light atomic particles per unit volume. low density The whereby molecules move from areas of high concentration to areas of lower concentration due to kinetic energy. Diffusion is used to quantify gas diffusion rates. Graham's Law What is the formula for graham's law? D(gas) = 1/Sqare root gmw is the rate of diffusion of a gas. it is defined as the number of mL of gas at 1atm of pressure that will diffuse a distance of 1um over a square cm surface area per minute. diffusion coefficient How does the gram molecular weight affect the diffusion of gases? Lighter gases diffuse rapidly and heavy dont. Pressure that gases exert when dissolved in a gas. Tension Gas tension depends on its? kinetic energy How does gravity effect density? it increases the density what are the SI units for pressure? N/m^2 what are the cgs units of gas? dynes/cm^2 what are the fps units for gas? lb/in^2 how can pressure be measured indirectly? the height in a column of liquid What is 1KPa = mmHg? 7.5mmHg What is 1KPa = cm H2O? 10.2cm H2O Represents force oer unit area. Pressure Standard Unit of pressure in cgs? 1 atm = 1030g/cm^2 Standard unit of pressure in fps? 1 atm = 14.7lbs/in^2 It is the simplest mechanical pressure gauge. Sealed evacuated metal box with a flexible, spring supported top that responds to external pressure changes. Aneroid Barometer. When vapor pressure is equal to air pressure this is called? Boiling point (review in book) Used to measure blood or airway pressure at the bedside. manometer Measures pressure. In this device, pressure changes expand and contract a flexible metal diaphragm connected to electrical wires. Strain gauge pressure tranducer Is the pressure exerted by a single gas in a mixture. Partial pressure Means the total pressure of a mixture of gases must equal the sum of the partial pressure of all component gases. Dalton's Law The partial pressure of a component gas must be ______ to its percentage in the mixture. proportional The partial pressure percentage in decimal form is called what? fractional concentration Example: a gas that is 25% of a mixture has a fractional concentration of? 0.25 What is the equation for Dalton's Law? Partial pressure = fractional concentration X total pressure The fractional concentration of inspired O2 remains constant at about 0.21 in the atmoshpere. But what if the barometric pressure changes, such as going up in altitude, what happens? The partial pressure of O2 drops 1 mmHg = ? cm H2O 1.36 cmH2O What determines the physiological activity of oxygen? the partial pressure not percentage. What can impair the oxygen uptake by the lungs when dealing with pressure? Decreased total pressure ( high altitude) At high atmosperic pressure, what happens to the PO2 in an air mixture? it increases Presures above atmospheric are called what? hyperbaric By increasing the barometric pressure you can do what to the pressure of O2? Increase Predicts how much of a given gas will dissolve in a liquid. Henry's Law What is the formula for Henry's Law? V = alpha X Pgas In Henry's Law, what does V stand for? Volume In Henry's Law, what does alpha stand for? the solubility coefficient In Henry's Law, what does Pgas stand for? the partial pressure of gas equals the volume of a gas that will dissolve in 1mL of a given liquid at standard pressure and specified temperature. Solubulity coefficient. What is the solubility coefficient of O2 in plasma at 37C and 760 mmHg? 0.023mL/1mL What is the solubility coefficient of CO2 in plasma at 37C and 760 mmHg? 0.510mL/1mL High temp. does what to solubility? decreases Low temp. does what to solubility? increases AuthorMagusB81 ID121343 Card SetPhysical Principles of RT Part 3.txt DescriptionRESP 130 Updated2011-12-06T23:08:15Z Show Answers