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Subject: Thermos flasks
Replies: 11 Views: 130

fir3hill 25.05.16 - 10:14pm
Aren't they amazing? I still can't figure out how the flask knows if it's hot or cold stuff you've put in it! * +

jayna 25.05.16 - 10:29pm
Somewhere i still got the one my parents used for holidays it weighs a ton. Its a large flask that holds 3 plastic cups in side the lid. Plus if you unscrew the bottom you will find a little glass milk bottle inside it. * +

bhb143 25.05.16 - 10:30pm
It uses a vacuum that has no air in it preventing cold air from entering keeping things hot or hot air entering keeping things cold * +

fir3hill 26.05.16 - 01:54am
But hot or cold air can't get into a jam jar with the lid on, but it won't work as a thermos. I mean air can't pass through glass, so I don't get this hot or cold air prevention theory * +

fir3hill 26.05.16 - 01:55am
Surely some kind of voodoo is involved? * +

fir3hill 26.05.16 - 02:00am
Can you get vacuums that do have air in them? I've noticed they're very shiny inside. Maybe the hot or cold air is reflected?,I just don't know. Where about in the thermos is the vacuum with no air? * +

crail 26.05.16 - 03:39am

It's not air passing through the glass, it's heat. Heat can't pass through a vacuum * +

crail 26.05.16 - 03:41am
So the vacuum is between the liquid and the outside * +

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