What is the difference between vacuum thermos with hot water bottle
Because a high requirement on the material... Think got a hot water and then pour out the water after put the lid on the poor plastic bottles to know...
So the effect of vacuum thermos is much better than general vacuum flask... But in the present case, the so-called vacuum thermos is difficult to guarantee quality,
The general vacuum flask is the air layer out to prevent heat loss, the so-called vacuum thermos is the air in the air layer removed to prevent heat loss, because of the heat transfer medium depends on
