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Old 02-11-2018, 04:38 PM   #11
Phantasm
 
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Default Re: Making metal transparent

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Originally Posted by TJSwoboda View Post
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Old 02-11-2018, 06:50 PM   #12
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Default Re: Making metal transparent

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Originally Posted by Flyndaran View Post
Checking specific heat, glass is actually worse than iron. So I'd assume that such transparent plates wouldn't fog more than a pair of glass glasses.
Annoying but not incapacitating.

I don't remember my first glass pairs ever icing over much even when below zero Fahrenheit.
I have spent the last week scraping frost and ice off my car every morning. Trust me, it's a thing. The colder it is, the worse the problem as you have to protect your face more and more, which tends to also collect the moisture from your breath near your face in one way or another.

But the biggest problem with the fishbowl-on-your-head is that it will contain nearly ALL the moisture from your breath. If it doesn't freeze, it will fog. Persistently.
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Old 02-11-2018, 08:09 PM   #13
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Default Re: Making metal transparent

A previous discussion pointed out that you can't breath through solid metal, so the helmet design would still need to perforations and/or gridwork over the mouth. I don't know if those airholes would be enough to keep the eyeplate from fogging.

I think you could also put some cloth padding over the cheekbones and bridge of the nose, and that might act as something of a vapor guard against the worst of the moisture from your mouth. Add some perforations around the eyebrows to help vent sweat, maybe?

Since the character who is making these faceplates is canonically a peasant from a country with a Mediterranean climate, she may not have experienced severe enough weather swings for the fogging to be a problem yet. It might be an annoying feature of the armor in a couple of weeks when she's in the northern plains and it gets really cold.
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Old 02-11-2018, 08:18 PM   #14
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Default Re: Making metal transparent

But even in a ski mask you weren’t breathing inside the goggles.

I suspect it would be more like a windshield fogging up.
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Old 02-11-2018, 08:37 PM   #15
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Default Re: Making metal transparent

Maybe some kind of metal partition to keep the eye section separate from the mouth part like a little insulating air pocket.
Still without some good ventilation, overheating if not suffocation would be a more important risk than loss of visibility.
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Old 02-11-2018, 08:57 PM   #16
Anthony
 
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Default Re: Making metal transparent

Having used transparent masks, fogging is an issue even at quite warm temperatures. The relative humidity of breath is 100% at body temperature (98.6F), it obviously gets mixed somewhat, but if you mix breath evenly with dry air, the dew point is still 76F.
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Old 02-11-2018, 09:19 PM   #17
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Default Re: Making metal transparent

A paintball mask (and my glasses) will fog up in just a few minutes. My glasses fog up, very quickly, when wearing my VR Headset if I exert myself too much (I'm looking at you, Robo Recall).

Both of those have ventilation, and the VR is isolated from my nose/mouth. Actually, leaving the bottom of the VR open slightly (not seating it fully), seems to keep my glasses from fogging, so long as I'm not playing Robo Recall.
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Old 02-11-2018, 09:39 PM   #18
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Default Re: Making metal transparent

Any sealed enclosure over flesh will eventually fog unless the exterior temperature exceeds skin temperature, and will do so fairly quickly if over a mucous membrane (such as eyes).
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Old 02-11-2018, 11:38 PM   #19
evileeyore
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Default Re: Making metal transparent

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Originally Posted by Mark Skarr View Post
A paintball mask (and my glasses) will fog up in just a few minutes.
It helps if you learn to breathe downward with your mouth. I have the same issue, and that helps tremendously.
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Old 02-12-2018, 12:10 AM   #20
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Default Re: Making metal transparent

"Listen up! I want you to polish that helm until I can see your face through it!"

Seriously though, low tech metals require a fairly hefty amount of cleaning to remove rust and grime. In some climates iron and steel will rust up fairly quickly.
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