What Is 'low' Humidity

[Khandro]

I want to sandwich two pieces of glass together with a space between them, they are outside and immovable. I want the least amount of moisture to be in the air trapped between them to avoid I hope any steam ever appearing on the glass inner surface.
So it would seem to be the best idea to do this when the natural humidity is at its lowest the forecast is for 45% humidity in a couple of days from now, would that be considered low?

Or does my project make no sense?

[TheChair]

Think you'd be better off buying a factory-sealed double-glazed unit.

[ToraToraTora]

no matter what you do it will steam up at some point unless it is a vacuum between the sheets, as above get a factory sealed DG unit.

[Khandro]

TTT, Thanks, I would if I could but in this case it isn't feasible.
I wonder why windows in passenger jets don't steam up, they don't appear to be double-glazed. I have observed they have tiny hole on the inside glass, what is that for?

[Zacs-Master]

it's called a breather hole and it's used to regulate the amount of pressure that passes between the window's inner and outer panes. In short, the system ensures that the outer pane bears the most pressure so that if there were a situation that caused added strain on the window, it's the outside panel that gives out (meaning you can still breathe).

[Khandro]

Zacs; Presumably the humidity varies inside the cabin, so why doesn't the gap steam up?

[Zacs-Master]

Not sure the humidity does vary when the cabin doors are shut.

[EDDIE51]

45% humidity is about as low as it gets in the UK.

[Khandro]

Thanks Eddie, that's what I wanted to know.

[EDDIE51]

Found this
https://www.currentresults.com/Weather/United-Kingdom/humidity-annual.php
It confirms 45% is pretty much the lowest it gets here. Average is more like 65 to 75%