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Pillow Talk
- Thread starter SilentPanda
- Start date
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I use one pillow. Do both sides that are down under get cold or just the lowest one?
That's right. I made that Australia "down under" joke. I'll be here all week. 🙂
Pillows are insulators, in that they hold air in them. The heat from the air rises to the top of the pillow, leaving the bottom of the pillow noticeabley cooler. This is similar to (but not exactly like) what happens with moisture-wicking fabric technology; except instead of wicking moisture from the body, the pillow is naturally wicking hot air from the bottom of the pillow.
SpookTheHamster
macrumors 65816
I just felt the underside of my pillow, feels around the same as the top.
During the night, I have to turn it over often. Sometimes, I turn the entire duvet over. Bliss.
I've always thought someone should invent a pillow that circulates perfect temperature air through it.
During the night, I have to turn it over often. Sometimes, I turn the entire duvet over. Bliss.
I've always thought someone should invent a pillow that circulates perfect temperature air through it.
wimic
macrumors regular
It depends on how deep you go - the hydrostatic pressure would tend to keep your tears in at greater depths.
mad jew
Moderator emeritus
colocolo
macrumors 6502
Can't say exactly why the bottom part seems cooler when you just get in bed; actually, it doesn't work that way always in my experience.
What I can say is why the bottom part is never warmer; being in permanent contact with another surface will not affect its temperature at all if the other surface isn't generating heat and is at the same temperature.
As a matter of fact, a sweater for example doesn't warm anything up; if you put your sweater to your chair, you can come back 10 hours later and find the chair as cold (again - provided it's a controlled environment with a stable room temperature and no object generating heat) than it was when u put the sweater around it. Cloth - and blankets for that matter - don't "warm" things up, just prevent heat from dissipating as quickly. Thus, two surfaces touching at the same temperature won't get warmer together.
A little off topic, but I always like to pinpoint this when I get into ANY thermodynamics conversation (I have no idea why, maybe I'm just crazy!): cold doesn't exist in reality, it's just lack of heat. 🙂
What I can say is why the bottom part is never warmer; being in permanent contact with another surface will not affect its temperature at all if the other surface isn't generating heat and is at the same temperature.
As a matter of fact, a sweater for example doesn't warm anything up; if you put your sweater to your chair, you can come back 10 hours later and find the chair as cold (again - provided it's a controlled environment with a stable room temperature and no object generating heat) than it was when u put the sweater around it. Cloth - and blankets for that matter - don't "warm" things up, just prevent heat from dissipating as quickly. Thus, two surfaces touching at the same temperature won't get warmer together.
A little off topic, but I always like to pinpoint this when I get into ANY thermodynamics conversation (I have no idea why, maybe I'm just crazy!): cold doesn't exist in reality, it's just lack of heat. 🙂
John Jacob
macrumors 6502a
Until I saw this thread, I never even noticed the temperature of my pillow. Now I know you can have warm and cool pillows.... 🙄 Cool, I learned something new on MR today.
