does opening a window create a pressure difference in my bedroom?

Question

my bedroom often stinks! you might imagine that the solution to this would be to open my window to 'air' out the room..........BUT
I have found that opening it has little effect!
I live in a walled off area so very little wind actually 'passes' by my window, even on a very windy day if i stick my head out the window i will barely feel anything. 
If i open a window in an adjacent room a weak breeze will blow through but i guess my real question is:

why wont my room air out from just opening the bedroom window?

Also if my room is very hot and i open the window the problem still persists! I assumed (obviously incorrectly) that due to it being significantly colder outside, and if my room is hot, then due to the pressure difference the hot air will flow out the window! 
This doesnt seem to be the case where Im living now and the room will stay warm for a very long time after opening the window..... whats going on?

Born Yesterday · Accepted Answer

For practical purposes; there is no measurable pressure
difference between indoors and outdoors unless you are
in a submarine or an air tight enclosure (not any normal dwelling).
Ventilation requires either cross flow or convection.
Most windows are double hung to permit convection.
The upper window must be lowered, and the lower window raised
to obtain circulation by indoor/outdoor temperature differential.
Placing a fan blowing outward at the top will also draw outdoor air
through the bottom.
There is often some pressure differential across different faces
of a building when wind is present. This pressure difference will produce
cross flow between windows if they are not mounted in the same wall.
Residential fenestration (windows) are normally selected to provide
5 air changes per hour when opened from top and bottom
if a modest indoor/outdoor temperature gradient exists.

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does opening a window create a pressure difference in my bedroom?

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