第1个回答 2010-08-18
Calorimeter ia a kind of instrument for measuring the quanlity of heat. It is composed with outer barrel and copper (or aluminium) small tube. The small tube is put on the wooden bracket in the outer barrel, and on the base of small tube, there has a heat proof support. Between the outer barrel and small tube, there should keep gap with water-proof air. And in order to provent the heat radiation, the material of bracket and outer barrel should be bad conductor of heat. Regarding to the cover of the outer barrel, generally speaking, it's made of wood, which has low heat transfer effeciency. To have this cover, it could stop the heat dissipation from radiation. There has two holes on the coverm one for thermometer, and one for stirrer. The stirrer is used for the exchange of the determinand (have it's temperature and quality) put into the water and the water, and the thermometer is used to measure the beginning temperature of water in the small tube and the temperature after mixing. The untouching of the two tubes could stop the heat transmission.
第2个回答 2010-08-18
The calorimeter is one kind of survey quantity of heat and so on instrument. It is (or aluminum) the nature small tube is composed of the outer sleeve and the copper, the small tube's base with the small support which does not transfer heat supports, the small tube places on the big tube's bust peg, moreover between the big and small tube has the crevice, the support and the big tube selects the hot not good conductor, like this may prevent the heat conduction radiation. Fastens down the tube lid may prevent the radiating. During two casings is the air which is not easy to transfer heat, in outer sleeve's cover, generally makes with the lumber, its heat transfer efficiency is low. Covers has two eyelets, inserts the thermometer, another inserts the agitator, the agitator uses for to cause in the investment water testing (known its quality and temperature) exchanges rapidly with the water temperature, but after the thermometer uses for to measure in the small tube the known quality water initial temperature and the mix temperature. During two casings does not contact prevents the hot transmission本回答被提问者采纳