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- the thermoflask is a container which can mainmtain temperature for several hours so that it can keep water hot in winter,or keep milk cold in summer.
- the thermoflask is a cylinder-shaped object with 30~40cm heightbetween 30cm and 40cm high.
- inside of it,there is a vacuum flask which is made of glass,there is no air inside the glass,which is near vacuum,so it is a poor conductor.
- in addition,the glass is silvered which is less infrared radiation.
- the outside layer of the glass is made of metal or plastic,which protect the fragile glass inside.
- at the bottom,there is a insulated support.
- at the top of the bottle,the cap is usually made of plastic. there is some heat lost here.
the top is a cap made of plastic which is covered by a plastic cup.this is taken off and used as a drinking cup. - finally,a plastic cup-drink closed the bottle at the toppest opening,which can be used as a cup to drink.
