What is Air pressure: Definition and 209 Discussions
Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa; 1,013.25 mbar), which is equivalent to 760 mm Hg, 29.9212 inches Hg, or 14.696 psi. The atm unit is roughly equivalent to the mean sea-level atmospheric pressure on Earth; that is, the Earth's atmospheric pressure at sea level is approximately 1 atm.
In most circumstances, atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. As elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation. Pressure measures force per unit area, with SI units of pascals (1 pascal = 1 newton per square metre, 1 N/m2). On average, a column of air with a cross-sectional area of 1 square centimetre (cm2), measured from mean (average) sea level to the top of Earth's atmosphere, has a mass of about 1.03 kilogram and exerts a force or "weight" of about 10.1 newtons, resulting in a pressure of 10.1 N/cm2 or 101 kN/m2 (101 kilopascals, kPa). A column of air with a cross-sectional area of 1 in2 would have a weight of about 14.7 lbf, resulting in a pressure of 14.7 lbf/in2.
is there any easy way, or relatively easy way, to calculate how much power is stored in a certain amount of air with a certain amount of pressure and flow? i know that's VERY vague, so let's say (random number's being chosen...) 30 psi at 100 cfm.
Hi I was wondering,
I have a project in college where i am asked to make a sensor of some sort, i then proceded to make plans and decided on a pressure sensor, i have looked everywhere for an air pressure equation that i could use involving the density of air and the volume of the pvc pipe i...
I'm building a hovercraft, and I am using an old computer fan to blow air into a plastic garbage bag and fill it up. I need to poke a few holes on the bottom of the garbage bag to let the air out, and I want to have a less friction as possible. What size should the holes be? And how many?
I vaguely remember a physics teacher once telling me that it is impossible to suck water through a straw that is longer than 32 feet because the air preassure is not strong enough to push it that high when you create a vacuum in your mouth. I know the mechanics behind sucking water through a...
Hi All,
I've come across something that surprised me but I'm sure has a logical explanation...
I have a two small ID tubes that have exactly equal impedance to air flow (for the purposes of the discussion the flow is 2ml/min). I connect them in series with one end of the system exposed...
what is the optimum air pressure for sound waves?
is there a graph that i can look at that ranges from 0 bar (or whatever it's measured in) to such high pressure that the air is almost a solid.
what would you measure the flow of sound waves in?
Alright, this might be a dumb question..
my friend and I are in a little debate. I have built two kinds of "potato cannons": one uses the force of a acetelyne gas + oxygen reaction for the energy (single explosion, flings it far). The other uses actual compressed air: I would pump air into a...
The air temperature at an altitude of 10,000 meters is a chilling
-35º C. Cabin temperatures in airplanes flying at this altitude are comfortable because of air conditioners rather than heaters. A.) Find the pressure at 10,000 m and B) Find the temperature of the air before the air...