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medical gas humidity

humidity and aerosol therapy

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 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