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medical gas humidity

humidity and aerosol therapy

QuestionAnswer
Rehydration of retained secreton can cause what hazard? Mucus pluging
If temperature of a saturated gas DECREASES Absolute humidity INCREASES
Common UNIT of MEASUREMENT in HUMIDITY Milligrams of water vapor per liter of gas (mg/L)
Air fully saturated with 100% WATER VAPOR 37 Celsius
Air fully saturated with BAROMETRIC PRESSURE 760 mmHg
Air fully saturated with WATER VAPOR PRESSURE 47 mmHg
Air fully saturated with ABSOLUTE HUMIDITY 44 mg/L
Barometric pressure is MEASURED by Barometer
Barometric pressure EFFECTS atmospheric availability of Oxygen
When barometric pressure DECREASES Elevation INCREASES
Define ABSOLUTE Actual CONTENT of WATER in a MEASURED VOLUME of AIR
Define RELATIVE Ratio of ACTUAL water vapor content to its SATURATED CAPACITY at a given TEMPERATURE
How is RELATIVE HUMIDITY expressed Percentage
How is RELATIVE HUMIDITY measured Hygrometer
% RH formula Content (absolute humidity) / saturated capacity (at certain temp) x 100
Capacity at 37 C is how much in (mg/L) 44 mg/L
Define % BODY HUMIDITY ratio of its ACTUAL WATER VAPOR CONTENT to WATER VAPOR CAPACITY in saturated gas at 37 C - capacity is fixed at 44 mg/L
Formula for % body humidity (Content) / (44 mg/L)
Define humidity DEFICIT Amount of water vapor that the body must add to a gas in order
Formula for Humidity Deficit (water vapor capacity) - (actual water vapor content) [44 mg/L]
Not changing out the water in the reservoir of a humidifying device every 24 hours will cause Cross contamination
Define CONDENSATION Cooling of gas causes water vapor to turn back into liquid state - returns heat and warms the surrounding environment
Define VAPORIZATION (evaporation) Liquid is changed into gas form. - cools the adjacent air
Cooling gas causes its capacity to hold water vapor to decrease
Warming of gas Gas raises its capacity to hold water vapor, vaporization is increased
If a gas is heated to body temperature (37 degrees) Capacity to hold water vapor increases to 44 mg/mL
If the gas leaves the unit and flows through tubing exposed to room air Condensation will occur - the temperature of room air is cooler causing vapor to turn back into liquid
Influence of pressure: High pressure in atmosphere Decreases vaporization (keeps water in)
Influence of pressure: Low pressure in atmosphere Increases vaporization (more pressure in unit than air, so water goes out)
Influence of surface area: Greater surface area Greater liquid evaporation - applied to the design of some humidifiers to increase their ability to put water vapor in the passing gas
Temperature: temperature increase evaporation INCREASES ( capacity increases and movement of particles increase so more escape/evaporate )
Temperature: temperature decreases evaporation DECREASES
Time: increased time exposed INCREASES humidity
Time : decreased exposure time DECREASES humidity
Factors affecting evaporation: 1. Influence of Pressure 2. Influence of Surface Area 3. Temperature 4. Time
Poses risks to patient and caregiver Condensation
Can waste a lot of water Condensation
Created by: dxb.0323