Vacuum flask in the relationship of water and heat preservation effect
Doing the experiment contrast: The experimental steps: 1, into half a bottle of boiling water in a thermos, in another vacuum flask filled with boiling water, cover the lid. 2, put the same amount of time (such as night), and then use the thermometer measured the temperature of the two bottles of water, record for T1 and T2, respectively. 3, compare the size of T1 and T2 The result: hold half a bottle of water in the heat preservation effect is good. Because the air is a poor conductor of heat.
And the heat preservation effect is good or bad basically is to see the cork, because the water inside the heat preservation, because is vacuum, if mixed with air, heat quickly, certainly is soon send out ~ the cork cover not tight that must not heat preservation
Cork cover methods: ground water overflowing, put on the bottle stopper gently, at this point, the water bottle stopper will be submerged and tightly capped bottle stopper. If worried about didn't cover tightly, can use a finger tapping the cork.
Vacuum flask of water inside the full heat preservation for a long time, the results hold water, the less heat preservation effect is poor. But, heard that the plug can't plug is too tight, easily inside the explosion.
