abat6294 t1_j2avb17 wrote
People talking about heat transfer at your foot, but I think the bigger affect is how when you stick your foot out, you've created an opening in the blanket that allows warm out to leave and for cooler air to enter.
BuildANavy t1_j2b2fzb wrote
100% this. Heat transfer from the foot itself is definitely a factor, but I don't think it's the biggest one. While by no means sealed, the air within the blanket becomes pretty stagnant and holds heat while you're underneath it. When you stick your foot out you are creating a significant opening as well as air currents and turbulence from the movement that allows a large exchange of warm air under the blanket with cold air from the room.
You can easily test this by very gently poking your foot out of the covers while keeping them tightly wrapped around your ankle. You don't get the same cooling effect (I just tried it while I was writing this).
P.s. if I'm hot in bed I just kick my leg up high, which lifts the covers and lets all the warm air out/cold air in. Don't need to leave my foot stuck out to be quickly cooled down.
bkydx t1_j2e7pse wrote
Incorrect.
Soles and palms are made of glaborous skin design to let heat out.
Cutaneous skin keeps heat in.
A fan or creating airflow is airflow has absolutely nothing to do with biology.
DonutCola t1_j2cur1m wrote
That’s silly dude there is no fan circulating air out of your blanket besides your asshole
tryinadosomethingher t1_j2dwddw wrote
Don’t need a fan.. do you o own what happens when hot and cold air touch? When a cold front hits a hot front? It’s creates rapid air movement :) this can be felt when opening a bathroom door after a hot shower
DonutCola t1_j2cuszs wrote
How tf does cooler air magically enter? You’re not really creating a viable convection current dude. It’s just like a brain illusion thing.
abat6294 t1_j2dviq9 wrote
It doesn't rush in, but now there is an interface where cold/warm air can exchange. Having 1 small opening for air to flow is significantly different than having 0.
tryinadosomethingher t1_j2dwugh wrote
Heat rises. When hot air from the blanket open and touch the cold air.. we’ll you know what happens when a cold and a hot front meet. Ever open the door after a steamy shower and see the air move fast? Same principle with the hot air under your blanket just not as drastic
tempusfudgeit t1_j2cwadl wrote
Tell me you've never been camping and slept in a sleeping bag
DonutCola t1_j2cwhrd wrote
That’s radiant heat
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