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Chem unit 3 (chptr5)

properties of gases, pressure, and measuring gas pressure.

QuestionAnswer
general properties of gas? 1) gas expands to fill their container 2) gases can be compressed 3) gases have relatively small densities compared to solids and liquids 4) gasses are miscible in all proportions 5) gases have low viscosities, or resistance to flow
what is pressure? the force exerted by gas molecules when they collide with the walls of their containers. (gas pressure)
pressure formula P=force applied/ specified area
what are the factors that the pressure of gas depends on? the volume of the container, the number of gas particles present, and the temperature
SI unit of pressure? pascal (Pa). 1Pa=1Newton/meters^2
another unit of pressure? 1 atm (standard atmospheric Pressure) = 101,325 Pa
what is a barometer? A barometer measures atmospheric pressure.
The pressure exerted by a fluid column in a barometer P=dhg, where P is the pressure in Pa, d is the density of the fluid in the barometer in kg/m3, h is the height of the column in meters, and g is the gravitational constant (9.807 m/s²).
closed-end manometer measures gas pressure relative to a vacuum (zero pressure).
Gauge pressure the pressure of a system above atmospheric pressure.
Created by: marshallw
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