# Is the pressure at the outer hole on a pitot static tube equal to atmospheric pressure?

I'm looking at a pitot static tube question right now and I just need some clarification. There is the outer hole on the pitot static tube, not the hole that the air stream goes through, but the other tiny one near that. Is the pressure at that hole equal to atmospheric pressure?

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What on earth is a pilot static tube?! – Killercam Oct 27 '11 at 21:25
Look it up on google – Greg Harrington Oct 27 '11 at 22:23
It is your question, it is not for me to go researching in order to help you. Make sure to defined the components of your question in explicit detail. Also, accept answers if you deem them to be correct... – Killercam Oct 28 '11 at 10:15
It's a pitot static tube. Anybody who has been introduced to fluid mechanics knows what a pitot static tube is. – Greg Harrington Oct 28 '11 at 16:03
The fact that I don't, means your last arrogant comment is not correct. – Killercam Oct 29 '11 at 10:31

A Pitot tube works my measuring the difference between static and total pressure. One opening of the tube is facing the flow: this one sees the total (stagnation) pressure. The other opening is perpendicular to the flow and sees only the static pressure.

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and static pressure is just the pressure of the free jetstream right? – Greg Harrington Oct 27 '11 at 22:25
That's correct. – Whelp Oct 27 '11 at 22:41
Thank you for the help – Greg Harrington Oct 28 '11 at 16:03