How to check whether the thermos insulation when buy hot water bottle?
Look at have three dots in the inside, with the mouth blown into the inside, heard the voice of the buzz that is good, can heat preservation.
2, water velocity measurement method in the empty bottle into half a bottle to a bottle of water, cover, about three minutes later, the hands hold the thermos test temperature, if feel hot, shows poor insulation performance; If you don't feel hot, heat preservation performance is good
To identify whether a new thermos insulated 1, listening method The empty bottle attached to the ear, echo the bigger the better! This is a way to detect the water inside have broken, the voice is the echo of air flow, the greater the echo, the better!
