| 查看: 387 | 回复: 0 | ||
[求助]
the boiling water method used to measure the porisity
|
|
The boiling method that was followed was: test samples were dried in a drying oven at 100 °C for one hour; then cooled to ambient temperature and the dry mass ݉m1 was immediately recorded to nearest 0.1 g; the samples were then placed in a beaker of distilled water and boiled for 2 h then cooled overnight in immersion liquid (water); the balance was zeroed for immersion weighing with loop or saddle for immersion test; the specimen was removed from the cooled immersion liquid and was placed onto loop or saddle and lowered into the water in position beneath the balance hook (ensuring that the specimen and saddle remain immersed during weighing and that they do not touch the sides or bottom of the vessel), the mass ݉m2 was recorded then the sample was put into another beaker of distilled water—this step was done three times for an average; to do the saturated test the specimen was withdrawn from the beaker of distilled water and quickly drained with excess water removed with a damp cloth with care taken not to touch the sample; the specimen was then placed onto the saddle or loop and suspended in air for a saturated mass ݉௦ measurement, the weight was recorded after 30 s to ensure all specimens have the same conditions. |
回复此楼» 猜你喜欢
博士自荐
已经有6人回复
-
博士推荐
已经有4人回复
-
求环氧树脂研发1名
已经有10人回复
-
280求调剂
已经有5人回复
-
什么是人一生最重要的？
已经有10人回复
-
面上可以超过30页吧？
已经有13人回复
-
为什么中国大学工科教授们水了那么多所谓的顶会顶刊，但还是做不出宇树机器人？
已经有13人回复
-
版面费该交吗
已经有17人回复
-
【博士招生】太原理工大学2026化工博士
已经有8人回复
