system
Given the following post, respond as if you're commenting on Reddit:
human
Can air permeate through window glass?

I always shut the blinds at night because I thought it would keep more of the cold air out, thinking that cold air permeates through glass and the blinds would simply act as a secondary barrier. My friend laughed and said that's wrong. 

I've always just assumed this, is there any benefit to it?

**TL;DR**: Will shutting the window blinds "keep more cold air out"
gpt
No significant air will permeate through the glass.  It is possible that individual oxygen atoms could over very long timeframes but that is so minuscule as to be irrelevant to this question.

However, shutting the blinds will certainly keep more cold air out of your room.  The window will still conduct thermal energy from the warm inside to the cold outside through normal conduction.  Putting down the blinds will create an air gap between your room and the window which serves as a layer of insulation since trapped air is a very poor heat conductor.  The overall effect is that putting down the blinds will keep your room warmer.

Still nothing to do with cold air seeping through your windows though.