<bdo id="smk4e"><mark id="smk4e"></mark></bdo>
<label id="smk4e"><samp id="smk4e"></samp></label>
      • 亚洲欧美日韩国产,麻豆精品新a v视频中文字幕,精品国产三级a在线观看不卡,伊人精品成人久久综合全集观看,99久久伊人精品综合观看,中文人妻无码一区二区三区信息,亚洲AV无码久久精品国产老人,成人女人看片免费视频放人

        產品列表PRODUCTS LIST

        首頁 > 測試服務 > TC3000 Thermal Conductivity
        TC3000 Thermal Conductivity
        點擊次數:3513 更新時間:2014-09-01

         

        Thermal conductivity measuring methods can be divided into steady-state method and non-steady-state method by macroscopic mechanism of thermal conductivity. 

        Steady-state method requires long period ,and there are also many other factors which affect measuring accuracy. However, non-steady-state method has the advantage of short measuring time, high accuracy and low requirements for operational environment. Especially, the transient hot-wire method has been considered internationally as the best measuring method of thermal conductivity in the research area of thermal conductivity.

         

        Measuring Principle

        The origin of hot-wire method could be traced back to the year 1780 when an American scientistJoseph Priestley made the first experiment about heat transfer ability of air. In 1931,Stâlhane and Pyk, who are the first to adopt transient hot-wire method in measuring the thermal conductivity of solid, powder and liquid,  Hot-wire method is now widely used in gas, liquid, solid, metal fusion and so on.