why is there an 'insulating layer of air"? a thermos uses a vaccum not air to retain temperature...
1877346
A thermos is sealed at the opening, but a mug isn't, and it's there where your thermal transfer will happen most. Hence, vacuum insulation would likely add a pointless expense to the manufacture of the mug. For my part, I find the mug insulates really well. I get no condensation on the outside of the mug with all ice and icewater in the mug, and if I put ice and water in the mug at night and leave it by my bed, I still have ice in the morning.
1877347
Because it would be tougher to make a true Dewar flask and air is still a pretty good insulator. So yeah, not as good as a real Thermos at keeping things cold/hot, but better than a ceramic mug of similar dimensions.
1877348
Air is a poor conductor of heat, and when trapped in a hollow area is an excellent insulator. Contrary to popular belief, insulation is not used to keep cold from entering an area, but only to retard the flow of heat. All substances, whether solid, liquid, or gas, contain some heat, so the condition of cold is merely a condition of relatively less heat. Heat can flow in one direction only-from a warmer body to a less warm body-so insulation serves to retard this flow. In a refrigerator, for example, insulation slows the flow of heat from the room air to the interior of the refrigerator. In a building, insulation keeps heat in during winter and out during summer. Air is a poor conductor of heat, and when trapped in a hollow area is an excellent insulator. Contrary to popular belief, insulation is not used to keep cold from entering an area, but only to retard the flow of heat. All substances, whether solid, liquid, or gas, contain some heat, so the condition of cold is merely a condition of relatively less heat. Heat can flow in one direction only-from a warmer body to a less warm body-so insulation serves to retard this flow. In a refrigerator, for example, insulation slows the flow of heat from the room air to the interior of the refrigerator. In... » Read More Air is a poor conductor of heat, and when trapped in a hollow area is an excellent insulator. Contrary to popular belief, insulation is not used to keep cold from entering an area, but only to retard the flow of heat. All substances, whether solid, liquid, or gas, contain some heat, so the condition of cold is merely a condition of relatively less heat. Heat can flow in one direction only-from a warmer body to a less warm body-so insulation serves to retard this flow. In a refrigerator, for example, insulation slows the flow of heat from the room air to the interior of the refrigerator. In a building, insulation keeps heat in during winter and out during summer. « Show Less
1777286
This uses a vacuum seal, instead of frozen water, to keep a drink cool. Putting it in the freezer does nothing to help.
1854733
warm air its exhasted by a top vent- on the top of the refrigerator unit-it can drain your battery if you turn off the motor of the vehichle
1289631
The inside thermos is SS and it looks to be uncoated. The cup/cap however has a plastic liner.
1678369
It's a single walled container. There is no thermal insulation. The lid has a plastic seal which should prevent leakage, but I have not exposed it to pressure, so not sure how well it seals. Basically, the container and contents will reach temperature equilibrium with its environment at a normal rate.
418985
It is not designed to be airtight. It has a series of holes drilled in the back for air circulation.
1657197
The coffee is hot when made. Then, due to the laws of thermal dynamics, it slowly cools to an equilibrium between the coffee and the outside environment the insulated pot is in. There is no button to press that can counter these basic laws of physics.
1645502
No, it is insulated to keep the heat in, in my opinion it is not worth the money, it does not keep hot beverages hot much longer than a regular cup, or colder than a regular glass. I purchased a stainless steel insulated thermos that keeps ice for 2 or 3 days, and hot at least 24 hours if you don't leave the lip off all the time. For the hot it still would keep your hands warm. Hopes this helps.
1764377
It's not meant to keep your water warm, only heat it up. If you want it to stay warm after you'll need a thermos.
1363493
it has a plug in the bottom which leads to a plastic tube to drain out of the bottom. it is not insulated, it is just a plastic liner within the resin chest. it worked well and kept our drinks cold.
2061025
It seems as though your numbers are lower than what I see. James comment about your altitude is important, but so is what you are trying to bag. If you are trying to bag some food that is hot (or even warm), it can reach "boiling" before you get to the level of vacuum you desire. Ideally any food being bagged should be cold to prevent this from happening.
2233196
I just read some other responses and on the losing coolness quickly, its like any bottle where the heat comes through....unless you put it into one of those insulators which slows down that process. One note...the colder the water is, the faster the heat flow is so that the cold absorbs the heat, so insulate it and the process slows. Former Heat/AC guy.
883206
Sorry...I wish I could help you. My daughter just lost it...I will be buying another one because I loved it so much! It kept food warm. I own another thermos, and the lid is plastic...hope this helps...
2092980
No, it's very well insulated. It doesn't get hot when there's hot liquid inside, and doesn't sweat or feel cold when there's cold liquid inside.
535841
I find with cold food it needs an ice pack so I imagine you would need to use an insulated thermos to keep foods really warm/hot.
1868243
No. It is designed like a thermos... to retain the heat from the boiling water that has been poured into it.
1874551
You are correct, it is not double wall insulated. As for why, I do not know, but I still love these cups!